Singapore, an island with no rivers and almost no groundwater, now meets roughly 40 percent of its water demand with treated sewage — piped through a 48-kilometre tunnel to a plant that sinks 25 storeys underground and processes 900 million litres a day.
On October 24, 1946, a 35mm DeVry cine camera bolted into a captured V-2 rocket climbed 65 miles above the New Mexico desert and returned the first photograph of Earth from beyond the atmosphere. The rocket shattered on impact. The steel-jacketed film cassette did not.
South Korea's hills, stripped almost bare by war and decades of fuelwood cutting, recovered to roughly two-thirds forest cover within 40 years through a state-run planting programme that paid rural households in grain and cash for surviving seedlings.
In 1994, ranger David Noble abseiled into a Wollemi canyon and found trees matching 90-million-year-old fossils. Roughly 90 wild Wollemi pines remain — the last of a lineage older than flowering plants.
What separates the vital seventysomethings from the rest isn't genetics or luck, but four deceptively simple daily choices that compound over decades.
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