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Leni and Oscar and the Secret of the Ballet Tree

A children's book about body awareness, courage, and the joy of learning

by Mathias Ellmann ...

What happens when courage moves faster than the body? And what helps when a child notices a great deal but does not yet fully trust their own perception?Leni and Oscar enter a ballet studio and discover that dancing is about much more than beautiful steps, turns, and jumps. Oscar wants to begin immediately and show what he can do. Leni watches closely, senses uncertainty, and notices things that ... Read more

Was $11.99 USD Now $6.99 USD or Free with Kobo Plus

What happens when courage moves faster than the body? And what helps when a child notices a great deal but does not yet fully trust their own perception?Leni and Oscar enter a ballet studio and discover that dancing is about much more than beautiful steps, turns, and jumps. Oscar wants to begin immediately and show what he can do. Leni watches closely, senses uncertainty, and notices things that
... Read more
Leni and Oscar and the Mystery of the Quiet Voice

A Children’s Book About Courage, Fairness, and Clear Words

by Mathias Ellmann ...

What can a child do when something feels unfair—but the right words get stuck in their throat? And what happens when the courage to help moves so quickly that it almost turns into conflict?Leni notices things that others often miss. She hears undertones, sees uncertainty, and senses when something is not right. But precisely when her voice matters most, it sometimes stays quiet.Oscar is different. ... Read more

Was $11.99 USD Now $6.99 USD or Free with Kobo Plus

What can a child do when something feels unfair—but the right words get stuck in their throat? And what happens when the courage to help moves so quickly that it almost turns into conflict?Leni notices things that others often miss. She hears undertones, sees uncertainty, and senses when something is not right. But precisely when her voice matters most, it sometimes stays quiet.Oscar is different.
... Read more
The Ballet Teaching Tree

Effective Teaching and Learning in Ballet through Body Knowledge, Motivation, Self-Assertion, and Artistic Development

by Mathias Ellmann ...

Why is repetition alone not enough in ballet? How can technical precision, physical health, motivation, self-respect, and artistic expression develop together?Ballet demands far more than the correct execution of positions, turns, and jumps. Learning emerges through the interaction of body knowledge, attention, memory, physical load, motivation, communication, practice, and artistic development ... Read more

Was $14.99 USD Now $9.99 USD or Free with Kobo Plus

Why is repetition alone not enough in ballet? How can technical precision, physical health, motivation, self-respect, and artistic expression develop together?Ballet demands far more than the correct execution of positions, turns, and jumps. Learning emerges through the interaction of body knowledge, attention, memory, physical load, motivation, communication, practice, and artistic development
... Read more
From Models to Decisions in Machine Learning with Python

From Models to Responsible Decision-Making

by Mathias Ellmann ...

What is the value of an accurate Machine Learning model if it leads to the wrong decision?Machine Learning identifies patterns, estimates probabilities, and generates predictions. But a model does not decide what should be done.Between prediction and action lie objectives, uncertainty, error costs, trade-offs, consequences, and responsibility.From Models to Decisions in Machine Learning with ... Read more

Was $14.99 USD Now $10.99 USD or Free with Kobo Plus

What is the value of an accurate Machine Learning model if it leads to the wrong decision?Machine Learning identifies patterns, estimates probabilities, and generates predictions. But a model does not decide what should be done.Between prediction and action lie objectives, uncertainty, error costs, trade-offs, consequences, and responsibility.From Models to Decisions in Machine Learning with
... Read more
From Data to Solutions in Data Science with Python

From Problem Definition to Responsible Solutions

by Mathias Ellmann ...

What is the value of a high-performing Machine Learning model if it solves the wrong problem?Data Science is often taught through methods: cleaning data, engineering features, training models, and comparing metrics.But real projects often begin somewhere else: with an unclear problem, conflicting expectations, incomplete data, uncertain target variables, and the question of which decision should ... Read more

Was $14.99 USD Now $10.99 USD or Free with Kobo Plus

What is the value of a high-performing Machine Learning model if it solves the wrong problem?Data Science is often taught through methods: cleaning data, engineering features, training models, and comparing metrics.But real projects often begin somewhere else: with an unclear problem, conflicting expectations, incomplete data, uncertain target variables, and the question of which decision should
... Read more
From Code to Solutions in Software Engineering with Java

From Problem Definition to Responsible Solutions

by Mathias Ellmann ...

What good is clean Java code if it solves the wrong problem?Software development is often taught through programming: writing classes, implementing methods, using data structures, and making applications run.But working code is not yet a good software solution. Problems must be understood, requirements clarified, alternatives developed, architectural decisions justified, and quality maintained ... Read more

Was $14.99 USD Now $10.99 USD or Free with Kobo Plus

What good is clean Java code if it solves the wrong problem?Software development is often taught through programming: writing classes, implementing methods, using data structures, and making applications run.But working code is not yet a good software solution. Problems must be understood, requirements clarified, alternatives developed, architectural decisions justified, and quality maintained
... Read more
The Salsa Teaching Tree

Holistic Learning through Movement, Perception, and Connection: Body Knowledge, Motivation, Musicality, and Partner Communication

by Mathias Ellmann ...

Why does a salsa figure work in class but not always on the social dance floor? Why can a movement feel effortless with one dance partner and suddenly become difficult with another?Salsa is more than steps, figures, turns, and counts. While dancing, the body, music, space, perception, decision-making, and partner communication must work together.The Salsa Teaching Tree shows how these areas can be ... Read more

$9.99 USD or Free with Kobo Plus

Why does a salsa figure work in class but not always on the social dance floor? Why can a movement feel effortless with one dance partner and suddenly become difficult with another?Salsa is more than steps, figures, turns, and counts. While dancing, the body, music, space, perception, decision-making, and partner communication must work together.The Salsa Teaching Tree shows how these areas can be
... Read more
Unmasking Populism

How to Recognize Manipulation, Evaluate Truth, and Act as an Enlightened Citizen in Politics and Society

by Mathias Ellmann ...

How quickly can a complex problem become a simple story with clear villains and an apparently obvious solution?Populist communication works not only through what is said, but through the way reality is simplified, emotionally charged, and divided into opposing camps.Unmasking Populism explains how these mechanisms work, why they can be persuasive, and how to recognize them without falling into ... Read more

Was $11.99 USD Now $7.99 USD or Free with Kobo Plus

How quickly can a complex problem become a simple story with clear villains and an apparently obvious solution?Populist communication works not only through what is said, but through the way reality is simplified, emotionally charged, and divided into opposing camps.Unmasking Populism explains how these mechanisms work, why they can be persuasive, and how to recognize them without falling into
... Read more
The Art of Fair Self-Assertion

How to Unite Clarity, Respect, and Responsibility

by Mathias Ellmann ...

Do you sometimes stay silent even when something matters to you? Or do you stand up for yourself only to realize afterward that you have overridden someone else?Between giving in and dominating others, there is another path: fair self-assertion.It means expressing your needs, boundaries, and convictions clearly while respecting the dignity, freedom, and legitimate interests of others.The Art of ... Read more

Was $11.99 USD Now $7.99 USD or Free with Kobo Plus

Do you sometimes stay silent even when something matters to you? Or do you stand up for yourself only to realize afterward that you have overridden someone else?Between giving in and dominating others, there is another path: fair self-assertion.It means expressing your needs, boundaries, and convictions clearly while respecting the dignity, freedom, and legitimate interests of others.The Art of
... Read more
Critical Thinking in Data Science with Python

From Observation to Responsible Decision-Making

by Mathias Ellmann ...

When does a number become insight — and when is it merely a convincing interpretation?Data Science works with data, statistics, visualizations, and models. But none of these speaks for itself.What we collect, measure, compare, model, and conclude always depends on assumptions, interpretations, and decisions.Critical Thinking in Data Science with Python presents Python, statistics, and machine ... Read more

Was $14.99 USD Now $10.99 USD or Free with Kobo Plus

When does a number become insight — and when is it merely a convincing interpretation?Data Science works with data, statistics, visualizations, and models. But none of these speaks for itself.What we collect, measure, compare, model, and conclude always depends on assumptions, interpretations, and decisions.Critical Thinking in Data Science with Python presents Python, statistics, and machine
... Read more
Fair SEO

Visibility Without Manipulation

by Mathias Ellmann ...

How can a website become visible without misleading people, pressuring them, or exploiting their uncertainty?SEO is often approached as a technical discipline: keywords, content, rankings, internal links, structured data, performance, and conversion rates.But visibility is more than a ranking. It influences which information people find, what expectations they develop, and how well they can ... Read more

Was $14.99 USD Now $10.99 USD or Free with Kobo Plus

How can a website become visible without misleading people, pressuring them, or exploiting their uncertainty?SEO is often approached as a technical discipline: keywords, content, rankings, internal links, structured data, performance, and conversion rates.But visibility is more than a ranking. It influences which information people find, what expectations they develop, and how well they can
... Read more

Data Science for Business

What You Need to Know about Data Mining and Data-Analytic Thinking

by Foster Provost, Tom Fawcett ...

Written by renowned data science experts Foster Provost and Tom Fawcett, Data Science for Business introduces the fundamental principles of data science, and walks you through the "data-analytic thinking" necessary for extracting useful knowledge and business value from the data you collect. This guide also helps you understand the many data-mining techniques in use today.Based on an MBA course ... Read more

$30.99 USD

Also available as: Audiobook

Written by renowned data science experts Foster Provost and Tom Fawcett, Data Science for Business introduces the fundamental principles of data science, and walks you through the "data-analytic thinking" necessary for extracting useful knowledge and business value from the data you collect. This guide also helps you understand the many data-mining techniques in use today.Based on an MBA course
... Read more

Also available as: Audiobook

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“mathias ellmann”

Leni and Oscar and the Secret of the Ballet Tree

Leni and Oscar and the Mystery of the Quiet Voice

The Ballet Teaching Tree

From Models to Decisions in Machine Learning with Python

From Data to Solutions in Data Science with Python

From Code to Solutions in Software Engineering with Java

The Salsa Teaching Tree

Unmasking Populism

The Art of Fair Self-Assertion

Critical Thinking in Data Science with Python

Fair SEO

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Data Science for Business

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