There is a saying that every day one should learn something new. Well, that is quite right. However, we should put some detail to that proposition. It is not just something new but some new joke. Even physicians can't deny that jokes are good and wholesome both for your health and mental performance. There is something more. Today is the day that all the tricksters and jokers around the world have been waiting for one year. We should honor that patience and give all of us a joke treat. Not just a joke treat. It comes from arguably the most difficult category – Science Jokes. So, enjoy your scientific treat and have a pleasant weekend.