Heads or Tails?
For fun, I wanted to do at least one instructable on science, because I was recently at a science competition.
Calling Tails
When calling tails, make sure that the person who flipped the coin, catches it with the other hand. According to my experiments, this worked around 60% of the time.
Calling Heads
When calling heads, make sure the person flipping the coin caught it in the same hand they flipped the coin with. According to my experiments, this worked 55% of the time.