Brain+Teasers

~Logic Puzzles~

A Petri dish hosts a healthy colony of bacteria. Once a minute every bacterium divides into two. The colony was founded by a single cell at noon. At exactly 12:43 (43 minutes later) the Petri dish was half full. At what time will the dish be full?
 * 1: Virile Microbes**

What mathematical symbol can be placed between 5 and 9, to get a number greater than 5 and smaller than 9?
 * 2: Symbol**

Rectify the following equality 101 - 102 = 1 by moving just one digit.
 * 3: Equation**

If it were two hours later, it would be half as long until midnight as it would be if it were an hour later. What time is it now?

A man encountered a bear in a wasteland. There was nobody else there. Both were frightened and ran away.Man to the north, bear to the west. Suddenly the man stopped, aimed his gun to the south and shot the bear. What color was the bear? Why? If you don't know, this may help you: if the bear ran about 3.14 times faster than the man (still westwards), the man could have shot straight in front of him, however for the prize he would have to go to the south.
 * 5: Bear**