It is Thursday evening and I did not travel this week. But I had a long long day. So, it counts as travel. And thereforre, here goes the next puzzle (variation of the standard tiger, goat, pile of grass and a man crossing the river):
3 missionaries and 3 cannibals are trying to cross a river filled with piranhas. The boat can take max 2 of them at a time. But if the cannibals outnumber the missionaries at any point of time, they will eat them up. How can they cross safely?