Covid: Why do some vaccines protect you for longer than others?

Here's why you need more than one Covid jab.

from BBC News - World https://ift.tt/i4rNxAV
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Giant tortoises return to Galápagos island after nearly 200 years

One hundred and fifty eight captive-bred juvenile tortoises were released on the Galápagos island of Floreana. from BBC News https://ift.t...