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Scorpion . Scorpions are predatory arachnids of the order Scorpiones. They have eight legs, a pair of grasping pincers and a narrow, segmented tail, often carried in a characteristic forward curve over the back and always ending with a stinger. There are over 2,500 described species. They mainly live in deserts but have adapted to a wide range of environments. Most species give birth to live young, and the female cares for the juveniles while their exoskeletons harden, transporting them on her back. Scorpions primarily prey on insects and other invertebrates, but some species take vertebrates. They use their pincers to restrain and kill prey. Scorpions themselves are preyed on by larger animals. Their venomous sting can be used both for killing prey and for defense. Only about 25 species have venom capable of killing a human. In regions with highly venomous species, human fatalities regularly occur. Scorpions with their powerful stingers appear in art, folklore, mythology, and commerc

MAUD Committee . The MAUD Committee was a British scientific working group formed during the Second World War to determine if an atomic bomb was feasible. The name came from a reference by Danish physicist Niels Bohr to his housekeeper, Maud Ray. The committee was founded in response to the Frisch–Peierls memorandum, which argued that a small sphere of pure uranium-235 could have the explosive power of thousands of tons of TNT. Its chairman was George Thomson and it met at Burlington House (pictured). Uranium enrichment, fissile materials, and the design of nuclear reactors and nuclear weapons were examined. The research culminated in two reports, known collectively as the MAUD Report. In response, the British created a nuclear weapons project. The report was made available to the United States, where it energised the American effort, which eventually became the Manhattan Project; it was also handed to the Soviet Union by its atomic spies, helping start the Soviet atomic bomb project.

Mysteries of Isis . The mysteries of Isis were religious initiation rites performed in the cult of the goddess Isis in the Greco-Roman world. Alluding to the worship of Isis from ancient Egyptian religion, they were modeled on other mystery rites, particularly the Eleusinian mysteries, which honored the Greek goddess Demeter. By undergoing the mystery rites, initiates signaled their dedication to Isis. Many texts from the Roman Empire refer to the Isis mysteries, but the only source to describe them is a work of fiction, the novel The Golden Ass, written in the second century by Apuleius. In it, the initiate undergoes ritual purification before descending into the innermost part of Isis's temple, where he experiences a symbolic death and rebirth and has an intense religious experience. Some aspects of the mysteries of Isis and of other mystery cults resemble elements of Christianity, but the evidence for their influence on Christianity is unclear.

Menstrual cycle . The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that make pregnancy possible. Naturally occurring hormones drive two concurrent and coordinated cycles that last about 28 days. The ovarian cycle controls the production and release of eggs and the release of the hormones estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the uterus (endometrium) to receive a fertilized egg. Menstruation, a "period" in common parlance, begins on day one of the cycle, and lasts for about five days. Around day fourteen, an egg is usually released from the ovary. Estrogen stimulates the uterus lining to thicken to accommodate an embryo should fertilization occur. If implantation does not occur, the lining is released during menstruation. Menarche (the first period) usually occurs around age twelve, and menstrual cycles usually

2007 Coca-Cola 600 . The 2007 Coca-Cola 600 was the twelfth stock car race of the 2007 NASCAR Nextel Cup Series and the 48th iteration of the event in the U.S. It was held on May 27, 2007, before a crowd of 175,000 in Concord, North Carolina, at Lowe's Motor Speedway (pictured), now called Charlotte Motor Speedway, one of ten intermediate tracks to hold NASCAR races. The 400-lap race on the speedway's standard 1.5-mile (2.4 km) track covers the longest distance of any event on the NASCAR calendar. The 2007 race was won by Casey Mears of the Hendrick Motorsports team, who started from 16th position. J. J. Yeley finished second and Kyle Petty came in third. There were thirteen cautions and 29 lead changes among fifteen drivers during the race. Kurt Busch held the lead for 107 laps, longer than any other driver. The 2007 race is Mears's only win in the Nextel Cup Series, now known as the NASCAR Cup Series.

Yazid I . Yazid I (c. 646 – 683) was the second caliph of the Umayyad Caliphate, ruling from April 680 until his death. His appointment, the first hereditary succession to the caliphate in Islamic history, was opposed by several Muslim grandees from Medina, including Muhammad's grandson Husayn ibn Ali. Husayn refused to recognize Yazid following his accession and left for Kufa in Iraq to lead a revolt, but was killed in the Battle of Karbala. To suppress the subsequent rebellion in Arabia, Yazid sent an army that captured and sacked Medina. Next, Mecca was besieged for several weeks until the army withdrew as a result of Yazid's death. The caliphate fell into a decade-long civil war known as the Second Fitna, ending with the establishment of the Marwanid dynasty. Yazid is considered an illegitimate ruler and a tyrant by many Muslims. Modern historians consider him a capable ruler, albeit less successful than his father Mu'awiya I, whose style of governance he continued.

Operation Rösselsprung (1944) . Operation Rösselsprung was a combined airborne and ground assault by the German XV Mountain Corps on the Supreme Headquarters of the Yugoslav Partisans during World War II. Launched on 25 May 1944, the operation was aimed at the Partisan leader Marshal Josip Broz Tito (pictured) and his headquarters. It is associated with the Seventh Enemy Offensive. The operation involved direct action via an airborne assault by the 500th SS Parachute Battalion and a planned subsequent link-up with ground forces, including Home Guard forces of the Independent State of Croatia and collaborationist Chetniks. Tito, his principal staff and Allied military personnel escaped. The operation failed due to fierce Partisan resistance, the failure of the various German intelligence agencies to share the limited intelligence available on Tito's exact location, and the lack of contingency planning by the commander of the German airborne force.