The median lethal dose (LD50) for acute radiation exposure is about 4.5 Sievert. The committed effective dose equivalent (CEDE) 210Po is 0.51 Sv/Becquerel if ingested, and 2.5 Sv/Bq if inhaled. So a fatal 4.5 Sv dose can be caused by ingesting , about 50 nanograms (ng), or inhaling , about 10 ng. One gram of 210Po could thus in theory poison 20 million people of whom 10 million would die. The actual toxicity of 210Po is lower than these estimates because radiation exposure that is spread out over several weeks (the biological half-life of polonium in humans is 30 to 50 days) is somewhat less damaging than an instantaneous dose. It has been estimated that a median lethal dose of 210Po is , or 0.089 micrograms, still an extremely small amount. For comparison, one grain of salt is about 0.06 mg 60 g.

How many more nanograms is a fatal 4.5 Sv dose for ingesting than inhaling?
A: 40

In January 1976 the Communist Party of Kampuchea promulgated the "Constitution of Democratic Kampuchea". The Constitution provided for a "Kampuchean People's Representative Assembly" to be elected by secret ballot in direct general elections and a State Praesidium to be selected and appointed every five years by the KPRA. The KPRA met only once, a three-day session in April 1976. The members of the KPRA, however, were never elected; the Central Committee of the CPK appointed the chairman and other high officials both to it and to the State Praesidium. Plans for elections of members were discussed, but the 250 members of the KPRA were in fact appointed by the upper echelon of CPK. Democratic Kampuchea was an atheist state, but Buddhist influences still persisted. All religions were banned, and the repression of adherents of Islam, Christianity, and Buddhism was extensive. Nearly 25,000 Buddhist monks were massacred by the regime. In actual fact, all power belonged to the Standing Committee of CPK, the membership of which comprised the Secretary and Prime Minister Pol Pot, his Deputy Secretary Nuon Chea and seven others. It was known also as the "Centre", the "Organisation," or "Angkar" and its daily work was conducted from Office 870 in Phnom Penh. For almost two years after the takeover, the Khmer Rouge continued to refer to itself as simply "Angkar." It was only in a March 1977 speech that Pol Pot revealed the CPK's existence. It was also around that time that it was confirmed that Pol Pot was the same person as Saloth Sar, who had long been cited as the CPK's general secretary.

How many months after the Constitution of Democratic Kampuchea was created did the KPRA first meet?
A: 3

Tampa Bay trailed Detroit 7-0 after the first quarter. The Buccaneers rallied in the second quarter, as Josh Freeman completed a 24-yard touchdown pass to Mike Williams, followed by 39-yard touchdown run by LeGarrette Blount. In the fourth quarter, Tampa Bay trailed 17-14. Freeman drove the Buccaneers to the Detroit 1-yard line. Kellen Winslow caught a touchdown pass, but it was nullified by an offensive pass interference penalty, and the Buccaneers settled for a field goal and a 17-17 tie. Tampa Bay took a 20-17 lead with 1:44 remaining in regulation. However, Detroit drove down the field, and Dave Rayner kicked a field goal for Detroit, and tied the game as time expired. Detroit won the coin toss in overtime, and Rayner kicked the game-winning field goal on the first possession. Had the Buccaneers won this game, they would have qualified for the playoffs and denied the eventual Super Bowl XLV champion Green Bay Packers a postseason berth.

How many points did the Tampa Bay lead in the fourth quarter?
A:
3