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.
Take the plunge: Valravn will open May 7 with a 90-degree drop and plenty screams. The new roller coaster at Cedar Point in Sandusky, Ohio, boasts that it is the tallest, fastest and longest dive coaster in the world. With its opening, Cedar Point will have 18 coasters. Last year, it introduced Rougarou; in 2014, it added Pipe Scream and in 2013, it added Gatekeeper. Valravn has a 90-degree drop and an unusual setup for the coaster cars, which are attached to one another in rows, feet dangling.