How B and T memory cells prepare for a second infection

An infection can leave behind cells ready for a rematch

When B and T cells recognize part of a germ, the matching cells multiply. Some remain in the body long after the infection is gone as memory cells. If the same germ returns, the immune system starts with a larger group of cells already prepared to fight it.

Earth's atmosphere is a shield against cosmic X-rays

X-rays from space are absorbed high in Earth's atmosphere, long before they can reach the ground. This protects life from much of the universe's high-energy radiation, but it also hides X-ray sources from ordinary observatories. To observe black holes, neutron stars and other X-ray-emitting objects, astronomers must send their detectors above the atmosphere.

Participants obeyed despite believing they caused harm

In the Milgram obedience experiment, ordinary American participants followed an authority figure’s orders even when they believed they were causing an innocent person severe suffering or apparent death.

Like this? There’s a whole feed of it. Replace empty scrolling with things worth knowing.

Download Hence for free

How B and T memory cells prepare for a second infection

An infection can leave behind cells ready for a rematch

Keep exploring