Experiment of December 7, 2020:

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Solution video:

Experiment:

Question:

Which washing method gives the cleanest hands?

A) Variant 1) [Without soap, only water, rub the flat hands against each other under running water for 5 seconds] gives the cleanest hands.

B) Variant 2) [With soap and water, rub the flat hands together under running water for 5 seconds] gives the cleanest hands.

C) Variant 3) [Without soap, only water, rub your hands all over, also between your fingers, under running water for 5 seconds] gives the cleanest hands.

D) Variant 4) [Wi th soap and water, rub your hands all over, also between your fingers, under running water for 5 seconds] gives the cleanest hands.