The idea of detecting life through an otherwise inexplicable anomaly in a planet’s spectrum dates back to the 1960s, when it was given voice by James Lovelock, a British chemist and inventor. It came into its own when astronomers started discovering planets around other stars, or exoplanets. Most of these planets are in inhospitably unearthlike orbits, but some sit within what astronomers call the “habitable zone”—the zone in which, under various conditions, the surface might support liquid water. Astrobiologists like Sara Seager of MIT started putting real effort into working out what anomalous gases might be visible once they got telescopes good enough to analyse the spectra of such planets’ atmospheres.
A few years ago some of the scientists who work with Dr Seager and in her team started to get interested in phosphine. Though it is not clear how microbes make it, or something which decomposes into it, its association with life is pretty clear (among other things, penguin guano seems rich in the stuff). There seem to be no appreciable mechanisms for making it abiotically either in the depths of the Earth or through the “photochemical” reactions driven by sunlight which create other short-lived gases in the atmosphere. And it has some nice distinct spectral lines which should be eventually observable in the infrared light from some sorts of exoplanet.
But what if Nero wasn’t such a monster? What if he didn’t invent the spectator sport of throwing Christians to the lions in the Colosseum? What if he wasn’t the tyrant who murdered upstanding Roman senators and debauched their wives? Indeed, what if the whole lurid rap sheet has been an elaborate set-up, with Nero as history’s patsy? After all, we have no eyewitness testimony from Nero’s reign. Any contemporaneous writings have been lost. The ancient Roman sources we do have date from considerably after Nero’s suicide in A.D. 68. The case against Nero, then, is largely hearsay, amplified and distorted over two millennia in history’s longest game of telephone. Besides, no one really wants to straighten out the record. Who wants another version of Nero? He’s the perfect evil tyrant just the way he is.
The impact theory is in some senses comforting. We have big telescopes, we can see into space now, in theory, if we knew an impact event was coming, we could prevent it. If it takes an impact to cause a catastrophic melting and sea level rise event, then we’re mostly safe from it happening. If the melting was caused by an impact, then it means our current climate models which estimate around a meter of sea level rise by the year 2100, are largely accurate.
But if these melting spikes were not caused by an impact, then it means something on earth which we currently do not understand triggered them. Something caused the ice sheets to suddenly and rapidly destabilize and release a large quantity of meltwater over a relatively brief period. If such an event were to occur today, the effects would be globally catastrophic. If an event caused a one-meter sea level rise over the course of a few years, it would render many of the world’s coastal cities uninhabitable.
In 1803, the [Spanish] king, convinced of the benefits of the vaccine, ordered his personal physician Francis Xavier de Balmis, to deliver it to the Spanish dominions in North and South America. To maintain the vaccine in an available state during the voyage, the physician recruited 22 young boys who had never had cowpox or smallpox before, aged three to nine years, from the orphanages of Spain. During the trip across the Atlantic, de Balmis vaccinated the orphans in a living chain. Two children were vaccinated immediately before departure, and when cowpox pustules had appeared on their arms, material from these lesions was used to vaccinate two more children.
If the Norse did reach Chichén Itzá, how did they get there? A possible Viking ship appears in a mural in a different building called Las Monjas, or ‘The Nunnery’. (The Spaniards assumed that any building with a large courtyard nearby had to be a nunnery, but the Maya had no nunneries.) Built before 950 CE, the Nunnery contains murals that might have been painted slightly later.
One Nunnery mural shows no captives but depicts a boat with clearly delineated planks, or strakes. The use of planks indicates that the Nunnery boat couldn’t have been a local craft because the Maya, like most of the peoples living in the Americas, made their canoes by burning and hollowing out tree trunks. Only one Amerindian people ever made boats with sewn planks, the Chumash, who lived in modern-day Santa Barbara, California. The sharply outlined strakes in this mural are better evidence of Norse presence at Chichén Itzá than the paintings of the blond-haired captives.
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