Figure 1
L. Corrochano/Univ. of Seville

Growing up fast. Phycomyces blakesleeanus is a single-celled fungus consisting of a stalk that can grow up to 10 centimeters and a spore-containing sporangium on top. The stalk rotates in alternating directions during growth, and a new theory explains the motion as the net effect of two different kinds of mechanical tension in the stalk. (See video below.)