As you put your finger in the water, the water tries to push up and float your finger. Because of this the finger pushes down...
Adding fresh water dilutes the salt water and reduces the amount the water lifts the egg.
The nuts float up to the top and fall back down again, like in a lava lamp. Gas bubbles grow on the peanuts, making them float...
We have been awarded 5 stars for our CPD programme.