The history of educational science software is, first and foremost, a history of teachers. Since the 1990s, teachers have been the ones building the tools that still equip thousands of classrooms today, coding in their own time, on evenings and weekends, for no pay. Over time, universities and foundations extended this offering with Scratch, PhET, Phyphox, and others: free software, often open source, adapted to real classroom needs because it was built by people who work the

In February 2026, Elon Musk announced his intention to install data centers in orbit to run artificial intelligence. Very quickly, one argument dominated the comments: in space, cooling would be “free”, since it is very cold there. This widely shared claim is nevertheless false. It reveals a common confusion between temperature, heat, and heat transfer. Above all, it offers a valuable opportunity to develop critical thinking and to revisit simple but fundamental questions: wh

The Shepard Tone : an infinite rise… or almost You're surely familiar with the Penrose staircase illusion, the seemingly endless staircase popularized by the artist M.C. Escher. But are you familiar with the Shepard Tone, an acoustic illusion conceived in the 1960s by the American psychologist Roger Shepard, which creates the impression that a sound rises—or falls—without ever reaching a peak? Let's explore and analyze this astonishing sound effect with the FizziQ app. The Or