Snow's map led him to the source of a London cholera outbreak in 1854

Cholera, John Snow and the Grand Experiment

A British physician first determined that cholera spread through contaminated water in the 1850s, but the disease remains a major health risk today

The silver spotted skipper butterfly is one of the most common butterflies caught during the census.

Name That Butterfly

Citizen scientists on a sharp learning curve are carrying out an important census in fields and gardens across the country

The Australian Dragonfish

Weird Creatures From the Deep

A massive census of the oceans has turned up a trove of strange marine wildlife, from jellyfish to octopuses to anemones

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