What is the best bit of Science that blows people’s minds when you demonstrate it in a party or social gathering?

Question: What is the best bit of Science that blows people's minds when you demonstrate it in a party or social gathering?
- Keywords:
  party,
  social gathering
Asked by 628amem49 to Adam, Breandan, Gabriel, Sarah, Sophie, Walaa on 12 Mar 2018.
- Walaa Elsayeh answered on 12 Mar 2018:
  
  A paper of my colleague when he found that bees love caffeine, just like us!
- Sophie Williams answered on 12 Mar 2018:
  
  I think telling people that the universe is 14 billion years old and the earth is 4.5 billion years old usually blows peoples minds! I like showing a timeline of the history of earth and the bit humans have occupied is literally tiny tiny tiny in earth’s history

Question: What is the best bit of Science that blows people's minds when you demonstrate it in a party or social gathering?