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What did Polish biologist Rudolf Weigl invent?

the first effective vaccine against typhus

medicine for cancer of the skin

diphtheria vaccine

EEG test method

Rudolf Stefan Weigl (2 September 1883 – 11 August 1957) was a Polish biologist and inventor of the first effective vaccine against epidemic typhus. He founded the Weigl Institute in Lviv, where he conducted vaccine research. There, during the Holocaust, he harbored Jews, thereby risking execution by the Germans.

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How do baby birds get oxygen inside their eggs?

They have a large oxygen supply from the start

Oxygen is created during protein reduction

Oxygen comes in through pores in the shell

They don't need oxygen at all

How deep is the root system of a giant sequoia?

4 meters (13 feet)

20 meters (60 feet)

40 meters (130 feet)

80 meters (260 feet)

How many chromosomes does a mule have? (A horse has 64, a donkey has 62)

It is infertile and does not have chromosomes

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Charles Perrault