Gifts for a Teenager Who's Into Science
By what they are into right now: space, dinosaurs, robots, storms, rocks, code, the gym. Plus the one thing to get right, which is the size.
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Journal
Short explainers of the science on the plates, and guides for choosing one. New pieces with every series.
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Every Element Has a Fingerprint: How Emission Spectra Work
Heat a gas and it emits a few precise colours, not a rainbow. Here's the physics — energy levels, photons, the Balmer series — and why every element's line pattern is unique.