Word: rates
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Dates: during 1990-1999
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...regarded as an unimportant peculiarity of the rodent brain and quickly forgotten. In the mid-1980s, Fernando Nottebohm of Rockefeller University brought new respect to the term birdbrain by demonstrating that the brain of an adult canary has the astonishing ability to regenerate new nerve cells at a rate of up to 20,000 a day. Other researchers reported similar regenerative ability in fish and reptiles, but there was still no evidence that evolution had passed on this ability to the human brain. Indeed, most neuroscientists wouldn't even entertain the possibility of new cell growth in the human brain...
...billion people on Earth. The Pollyannas say the more the merrier; the Cassandras say that is already twice as many as can be supported in middle-class comfort, and the world is running out of arable land and fresh water. Despite a recent slowdown in the growth rate, the U.N. Population Division expects the world population to reach 9.5 billion by the year...
...continue, at our present rate, to strip-mine the sea of its living resources, 25 years from now we'll be lucky to find a seafood menu that offers a rock sandwich with a side order of kelp. Consider the swordfish: angler's prize, gourmet's delight, fisherman's livelihood. In the mid-'60s, when I was in my mid-20s, I caught a swordfish off Long Island. I wasn't trying to; it took bait meant for sharks. The fish was weirdly, atypically lethargic. It didn't struggle much, didn't leap at all, just tugged for a while...
...million deaths in the past year alone, the AIDS virus has become the deadliest microbe in the world, more lethal than even TB and malaria. There are 34 developing countries where the prevalence of this infection is 2% or greater. In Africa nearly a dozen countries have a rate higher than 10%, including four southern nations in which a quarter of the people are infected. And the situation continues to worsen; more than 6 million new infections appeared in 1999. This is akin to sentencing 16,000 people each day to a slow and miserable death...
Number of AIDS Rate of Growth THE SPREAD OF HIV cases in thousands...