Why is the sky blue by day and black at night?
How air redirects sunlight towards our eyes, why sunsets turn red, and why the darkness between stars needs a separate explanation.
Part 2 of 100Science · Ideas · Projects · Life
Articles
Notes, explanations and little explorations of how the world works.
What is artificial intelligence: how it learns and why it makes mistakes
Using a spam filter, explore model training and inference, neural networks and generative AI, and how to check an output that is useful but fallible.
What is mathematics: from a question to a justified answer
How can 24 metres of edging enclose different areas? One problem introduces mathematical models, variables, formulas, and the difference between an example and a proof.
What is space, and where does it begin?
From passenger aircraft to Starlink: the conventional boundary of space, why the atmosphere does not end at 100 km, and how a Blue Origin flight differs from a SpaceX flight.
Part 1 of 100