Science
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Hamiltonian Monte Carlo Explained
An interactive 3D explanation of Hamiltonian Monte Carlo sampling, showing with live demos how a particle explores compl…
HAMNB
A hand-typed, tracker-free home for project logs on solar power, 3D printers, Home Assistant, electronics, mesh radio an…
Handle the Heat
A baking site by Tessa Arias that explains the science behind cookies, cakes, and brownies through side-by-side ingredie…
Handwriting vs Typing: Brain Connectivity Study
A peer-reviewed EEG study finding that handwriting activates much wider brain connectivity than typing, with notes on wh…
Happy Daze
A daily dose of good news from science, with uplifting stories across physics, space, biology, medicine, and materials,…
Harmony of the Spheres
A generative browser toy in which planets orbit a sun and sound musical notes as they move, turning an old idea about th…
Harmony of the Spheres
A 3D gravity and space simulator where you explore scenarios from our solar system and beyond, adding bodies and watchin…
Harry Potter and the Methods of Rationality
Read the complete fan novel in which Petunia married a professor and Harry grew up on science, tackling the wizarding wo…
Harvard College Observatory History in Images
A personal project collecting early images of the Harvard College Observatory on Observatory Hill, with historical photo…
Has a Nuke Gone Off?
A live, always-on answer to one question, powered by two home-built gamma and optical detectors in Wiltshire, plus build…
Has the Large Hadron Collider Destroyed the World Yet?
A deadpan single-serving joke site from the collider's 2008 startup era that has answered the same reassuring question,…
Have Attention Spans Been Declining?
A reader-written contest essay that digs into the evidence for and against shrinking attention spans, weighing studies a…
HawkWatch International
A raptor conservation nonprofit that runs migration count sites and shares hawk, eagle, and falcon identification resour…
HDEV: Live Earth from the ISS
A live high-definition video feed of Earth from cameras mounted on the International Space Station, with details on the…
HDR Astrophotography
Nicolas Lefaudeux's high dynamic range photographs of total solar eclipses, revealing the solar corona in astonishing de…
Healthy Minds Innovations
The Healthy Minds Program from neuroscientist Richard Davidson's nonprofit offers a free science-backed meditation app b…
Hearing Test
A quick online hearing test with no sign-up that plays tones across the frequency range so you can find the highest pitc…
Hearth
Free no-signup calculators for everyday pet and sleep questions, such as dog chocolate toxicity, dog age, and caffeine c…
Heat Pumps, Hooray!
A cheerful illustrated explainer on why heat pumps beat gas furnaces, paired with a free calculator that estimates the c…
Heatmap News
A news publication devoted to climate change, covering energy, policy, technology, and the economics of decarbonizing th…
Heavens-Above
A long-running satellite tracking site that predicts visible passes of the ISS, Starlink trains, and thousands of satell…
Hedonometer
An instrument measuring the collective mood of large populations from the words they post online, with happiness time se…
Height vs Wealth
An interactive visualization imagining humans as tall as they are rich, where height follows the wealth distribution and…
Helios
An address-level estimator of what plug-in solar panels could generate at any home in Great Britain, built to help answe…
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