1 The cerebrum makes up 85 percent of the brain's weight. 2  It contains about 86 billion nerve cells (neurons), the gray matter. 3  It contains billions of nerve fibers (axons and dendrites), the white matter. 4  These neurons are connected by trillions of connections, or synapses.
Making a Mammoth splash: The longest water-coaster in the world. These are the first images of the world's longest water-coaster - a ride that is guaranteed to make a splash when its (flood) gates open next year. The Mammoth, which cost $9 million (Â£5.5 million) and features a five-storey drop, will open at Holiday World & Splashin' Safari, in Santa Claus, Indiana, in May 2012.
Six Flags Great America, Gurnee, Illinois. Goliath has the longest drop, the steepest drop and goes faster than any other wooden rollercoaster. Riders plunge down a 180-ft (54 metre) initial drop at a near vertical angle of 85 degrees and travel at speeds of 72 miles per hour. sixflags.com/greatamerica. The Undertow.