biology

Every landmark science experiment in one hub: Pasteur's swan-neck flask, Galvani's frog legs, Eratosthenes, Michelson–Morley, Hafele–Keating and more than 140 others, grouped by field and era.

The complete guide to biology in 2026: cells and genetics, evolution, the human body, neuroscience, disease, immune systems, and the future of genetic engineering.

Fireflies produce light through a chemical reaction called bioluminescence, where the protein luciferin is oxidized by the enzyme luciferase using oxygen and ATP to emit photons with nearly zero heat loss. The insect controls flash timing by regulating oxygen flow to its light organ, and each species produces a distinct flash pattern used for mating recognition. This same light-producing chemistry has become essential to modern biology, allowing researchers to track gene expression, detect ATP in tissue samples, and study cellular processes in real time.

Chlorophyll breaks down in autumn leaves, unmasking yellow and orange carotenoid pigments that were present all along. Meanwhile, trees synthesize new red and purple anthocyanins, while shorter days and cooler nights trigger senescence—a programmed shutdown that eventually leads the tree to seal off and drop each leaf at a specialized abscission layer. This cascade of biochemical events helps trees conserve resources for winter.

An intact onion does nothing to your eyes. But cutting one releases enzymes that act on sulfur compounds, triggering a chemical cascade that produces syn-propanethial-S-oxide — a volatile gas that irritates your cornea and forces your eyes to water. The science behind this everyday kitchen reaction reveals how plants weaponize chemistry as a defense mechanism.

Blood types are inherited molecular markers on red blood cells. The ABO polymorphism has been kept alive in primates for at least 20 million years, and infections such as malaria, cholera, and norovirus are the leading explanation for why.

CRISPR turned a bacterial immune system into a gene-editing tool. This article explains the discovery, mechanism, clinical results, and ethical stakes.

Dolly proved that an adult cell nucleus could be reprogrammed to create a whole animal. This guide explains the experiment and its impact.

The Human Genome Project sequenced all 3 billion base pairs of human DNA for $2.7 billion. Here is how the 13-year effort worked and why it still matters.

The microscope opened the hidden world of cells and microbes. This article explains lenses, early makers, Leeuwenhoek, Hooke, and modern microscopy.

Fingerprints exist primarily to improve grip and amplify fine touch. The ridged skin on your fingertips enhances friction against smooth surfaces and channels vibrations toward specialized nerve endings — but the exact patterns those ridges form are shaped by a reaction-diffusion process that plays out in the womb, governed by competing molecular signals that no two people, not even identical twins, experience in quite the same way.

Ask which animal kills the most people and the mind jumps to sharks, lions, or crocodiles. The real answer is something you've swatted without a second thought: the mosquito, which killed an estimated 597,000 to 610,000 people in 2023 and 2024 alone — more than every large predator combined, many times over. The deadliest animals on Earth aren't the biggest or fiercest. They're the ones that carry disease, and the ranking overturns almost everything our instincts tell us.