Identifying the very oldest asteroid families, those billions of years old, is challenging, because over time, a family spreads out. As asteroids rotate in orbit around the Sun, their surfaces heat up during the day and cool down at night. This creates radiation that can act as a sort of mini-thruster, causing asteroids to drift widely over time. After billions of years, family members would be almost impossible to identify, until now. The team used a novel technique, searching asteroid data from the inner region of the belt for old, dispersed families. They looked for the “edges” of families, those fragments that have drifted the furthest.
Over a long period of time, the slightly denser regions of the nearly uniformly distributed matter gravitationally attracted nearby matter and thus grew even denser, forming gas clouds, stars, galaxies, and the other astronomical structures observable today.  The details of this process depend on the amount and type of matter in the universe. The four possible types of matter are known as cold dark matter , warm dark matter , hot dark matter , and baryonic matter . The best measurements available, from Wilkinson Microwave Anisotropy Probe (WMAP), show that the data is well-fit by a Lambda-CDM model in which dark matter is assumed to be cold (warm dark matter is ruled out by early reionization ),  and is estimated to make up about 23% of the matter/energy of the universe, while baryonic matter makes up about %.  In an "extended model" which includes hot dark matter in the form of neutrinos , then if the "physical baryon density" Ω b h 2 is estimated at about (this is different from the 'baryon density' Ω b expressed as a fraction of the total matter/energy density, which as noted above is about ), and the corresponding cold dark matter density Ω c h 2 is about , the corresponding neutrino density Ω v h 2 is estimated to be less than . 
Test 2 reveals what happens when this Rat is aerobicised with a set of headers. As you can see from the dyno chart, headers are probably the single most important component you could bolt onto the big-block to enhance performance. This is especially important since the rectangle-port big-block heads are not known for their excellent exhaust-port flow, so any improvement on the exhaust side will do wonders to unlock power. This boosted torque from 450 lb-ft to a solid 500 lb-ft. Better yet, the entire torque curve improved. Even at 2,400 rpm, the torque was up an amazing 35 lb-ft over the iron manifolds.