Administration: Individual. The DAB-4 is a revision of one of the most popular individual achievement tests available. Its 8 subtests identify studentsâ strengths and weaknesses across important areas of school achievement. A supplemental manual shows how to probe student responses to obtain information about studentsâ thinking processes and problem-solving strategies.
In 1992, the first evidence of a planetary system other than our own was discovered, orbiting the pulsar PSR B1257+12. Three years later, 51 Pegasi b, the first extrasolar planet around a Sunlike star, was discovered.
1 Uranus, the 7th planet, was first discovered by means of a telescope in 1781. 2  Two astronomers (scientists who study the stars and planets), J.C.Adams in England and Urbain Le Verrier in France, had been puzzled by the shape of Uranusâ orbit.