Lots of girls worry that it will never happen for them, but it almost always does. A girl's first period usually arrives about 2 years after she starts developing breasts. See the doctor if you are 14 and have seen no breast development or other signs of puberty. A girl also should see the doctor if she's 16, has had some body changes, but still hasn't had her first period.
Existing communications and computer architecture are increasingly being limited by the pedestrian speed of electrons moving through wires, and the future of high-speed communication and computing is in optics, experts say. The Holy Grail of results would be "wireless interconnecting," which operates at speeds 100 to 1,000 times faster than current technology. The new discovery, made by researchers at Oregon State University, the University of Iowa and Philipps University in Germany, has identified a way in which nanoscale devices based on gallium arsenide can respond to strong terahertz pulses for an extremely short period, controlling the electrical signal in a semiconductor. The research builds on previous findings for which OSU holds an issued patent.
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