One way to ensure you're right at least some of the time is to make the same prediction year after year -- after all, a stopped clock is right twice a day. "Dr. Doom" himself -- New York University economist Nouriel Roubini -- has been expecting a U.S. financial catastrophe for years. As Anirvan Banerji of the Economic Cycle Research Institute told the New York Times Magazine last year, Roubini's explanations -- increasing trade deficits, soaring current account deficits, Hurricane Katrina, skyrocketing oil prices -- have tended to evolve over time. But as we now know, he hit the jackpot by calling the housing bubble in 2006. Smart or lucky? Wait to see where his next predictions land.

The purchases weren't about land, but water. For with the land comes the right to withdraw the water linked to it, in most countries essentially a freebie that increasingly could be the most valuable part of the deal. Estimated on the basis of one crop per year, the land purchased represents 55 to 65 cubic kilometers of embedded freshwater, an amount equal to roughly 1½ times the water held by the Hoover Dam. And, because this water has no price, the investors can take it over virtually free. It's not quite a scenario from a James Bond movie, but the rush to lock up scarce water resources in agricultural belts is nonetheless disturbing. It suggests another food crisis might not be too far away.

It sounds counterintuitive, because lower oil prices are making fuels from farm and forest land less competitive. This is true, but only in the short run. The crisis has boosted awareness that dependency on a limited set of resources, including financial products, must be avoided by all means. The best response is diversification -- and biofuels will be a major beneficiary of this incipient trend.

Africa still evokes in the minds of many some mix of corruption, disease, war, and poverty -- the Four Horsemen of Africa's Apocalypse. Indeed, the economic crisis has fueled a whole new round of such worries. But the perpetual hand-wringing over the continent's dreadful state misses a broader trend: Africa is rising, and it could emerge from the crisis stronger than most people think.

Psychologists and other social scientists (most economists excepted) have learned a lot in the last few decades about what makes us happy. They have taught us that, in affluent societies, money doesn't buy as much happiness as people think. Indeed, for people living above subsistence, it may buy very little. They have also taught us what affects well-being more than money: close relations with family, friends, and community; meaningful work; security (financial, job, and health); and democracy.

From birth on, no moment in a person's life will go unmonitored. At each street corner, at the entrance to each home, perhaps even inside each room and under each bed, there will be a metal box, tamper-proof and solid enough to prevent burglary. Each box will contain a receiver and a transmitter linked to a central computer. Every time a person passes near the box, an electronic report will go out. It will run somewhat as follows: "The level of the anger hormone carried in the bloodstream of No. KJ-090679883 is a little elevated. Inject 21 milligrams of the relevant antidote into his bloodstream to prevent him from turning violent."

Taken together, these discoveries mean that one can write out a life code, manipulate a cell, and execute a specific desired function. It means we can convert cells into programmable manufacturing entities. But this software builds its own hardware, allowing companies to begin using bacteria to produce chemicals, fuels, medicines, textiles, data storage, or any series of organic products.

Well-programmed computers -- whether in the form of personal computers or hand-held devices -- are becoming the vehicles of choice. They will offer many ways to master materials. Students (or their teachers, parents, or coaches) will choose the optimal ways of presenting the materials. Appropriate tools for assessment will be implemented. And best of all, computers are infinitely patient and flexible. If a promising approach does not work the first time, it can be repeated, and if it continues to fail, other options will be readily available.