Elysia sea slug head body regeneration chloroplasts

Young sea slugs can regrow a body from the head

Young Elysia sea slugs can shed a body infected with internal parasites, then regrow a new one from the detached head. The head keeps chloroplasts—parts taken from algae—that let it use sunlight to make food and survive without its digestive system.

Official COVID case counts missed millions of infections

A confirmed COVID-19 case required a positive test, but many infected people were never tested. Studies that randomly tested populations repeatedly found far more infections than official case totals suggested. The gap was especially large early in the pandemic, when tests were scarce and people with mild symptoms often went undetected.

Plague returned to Europe for centuries

The Black Death killed an estimated 25 million people, about a third of Europe’s population at the time. Plague is thought to have returned roughly every generation, with varying severity, until the 18th century.

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Elysia sea slug head body regeneration chloroplasts

Young sea slugs can regrow a body from the head

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