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.
The Kingda Ka is the No. 1 roller coaster in the world for both height (456 feet) and drop (418 feet). The world's longest coaster is the Steel Dragon 2000 in Nagashima Spa Land in Japan. Its total length is just over 8,133 feet â that's more than a mile and a half long!