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.
Banshee stands 167 feet (51 m) tall and features a first drop of 150 feet (46 m). With a length of 4,124 feet (1,257 m), the ride is the world's longest inverted roller coaster. The ride includes seven inversions including two vertical loops, a dive loop, a zero-g roll, a pretzel knot and an inline twist.