Neil Levy

Pandas are notoriously picky eaters: they only eat bamboo. But a recent study has found that pandas are actually poorly adapted for their diet. Pandas apparently evolved from omnivorous bears. Whether as a consequence of a decrease in the availability of prey or an increase in bamboo, however, they shifted to an exclusively vegetarian diet about two million years ago. But they did not evolve the kind of digestive apparatus usually seen in herbivores. They have a carnivore’s digestive system, and they lack the gut flora required for extracting the maximum amount of energy from plant-based sources. Hence, perhaps, the fact that they spend so much of their time eating.Read More »Pandas, Humans, and Evolution: What is the state of nature?

So we (whether ‘we’ are British, or Australians, apparently) have a new princess. Only the most curmudgeonly among us can resist a small smile at the news, right? A small minority holds themselves aloof, dismissing the whole circus as an anachronism, but no one actually thinks there is a downside. Well, I do. I think in a small way (through no fault of her own, obviously) baby Charlotte will contribute to making the world a little worse.Read More »The Pink Princess

Last week, the Guardian ran an article about “Russia’s Troll Army”. “Troll” is something of a misnomer here: the people in question are not out to provoke a reaction. Rather they are paid to promote the government’s line on political and social issue. They maintain blogs and social media profiles under pseudonyms, where they post made up incidents from fabricated lives, interspersed with political posts they are instructed to write, lauding Russia’s intervention in the Ukraine (for example). And of course they post comments on news stories, on Russian and foreign websites (for reasons unknown, they don’t seem to target Practical Ethics).Read More »What’s wrong with paid comment?

Vaccination has been in the news recently, as an outbreak of measles hits California. The US virtually eliminated measles around the turn of the century, but it has made a comeback. A big factor in that comeback has been ‘conscientious objection’ on the part of parents, who refuse to have their children vaccinated for religious or ‘philosophical’ reasons. Media reports often focus on the ignorance or confusion of these parents. And there’s plenty of both on show. Prominent anti-vaxxers continue to push the long discredited vaccination causes autism line, while the California conscientious objectors seem to have embraced an ill-informed ‘no chemicals’ line. I want to suggest that these views may be motivated, to some extent and in at least some parents, by the omissions bias.Read More »Vaccination and the omissions bias.

A recent blogpost on 3 Quarks Daily satirised the idea of ‘moral offsetting’. Moral offsetting would work like carbon offsetting. With carbon offsetting, you purchase carbon credits to offset against your emissions – for instance, you might give money to a private company that plants trees, to offset your transatlantic flights. Moral offsetting works in a similar way: whenever you indulge in behavior of dubious morality (say eating meat, or buying clothes made in a sweatshop), your transgression would be offset. The simplest way to offset would be through a donation to a charity.Read More »Moral Offsetting

Clinton Cards recently apologized for a Christmas card listing “10 reasons why Santa Claus must live on a Council Estate” (sample reasons: “He only works once a year”; “He drinks alcohol during working hours”). Predictably, some people professed outrage over the card (which seems to me mildly offensive, but not enough to get worked up over) and equally predictably some people slammed the reaction as an excess of political correctness (whatever that means). Humor is very often at someone’s expense. In fact, some people have suggested that making the person who laughs feel superior to the butt of the joke is the essence of humor. That theory is rather implausible, but we certainly don’t want a blanket ban on jokes that target other people. When is it okay to tell jokes at the expense of others and when isn’t it?Read More »The Ethics of Humor

Australian columnist and TV personality Mia Freedman has been caught in a social media storm after comparing pedophiles to gay people. Freedman’s gaffe didn’t warrant the furious response it got; the response seems mainly the product of people’s inability to understand how analogies and similes work. Freedman, arguing in favor of a public sex offender’s register, claimed that we ought to expect pedophiles to continue to be a danger to children, because they can’t change who they’re attracted to, just like gay people can’t change who they’re attracted to. Freedman’s point was that we used to think that gay people could be ‘cured’; we now accept that that’s a fantasy. So we should say the same thing about pedophiles.

Read More »Pedophiles and homosexuals – apples and oranges?

We’re not good at large numbers. Our brains are adapted to living in groups of perhaps 150 individuals. City living is a very recent innovation, and our psychological mechanisms struggle to cope with it. One way in which we may go astray is through the misapplication of heuristics that worked well for our ancestors, but which misfire in very large groups. Suppose you learn that there is a person in your group prone to violence without provocation. If you live in a group of 150 individuals, you need to be on high alert: your paths will cross. But if you live in a city of 5 million people, you really shouldn’t worry (unless you have some reason to think the violent individual lives in your street). In fact, on learning that there is such an individual you will probably feel more anxiety than you should – not as much as you would if you knew your paths would cross, but more than you rationally ought to.Read More »She was one in a million, so there’s five more just in New South Wales.

That’s (roughly) the topic of a panel held at Sydney’s Festival of Dangerous Ideas. It is a topical question, in this age of potentially catastrophic climate change. There is no realistic risk that climate change threatens life on this planet, after all,  but it could threaten human existence (not directly, but by triggering widespread conflicts over scarce resources). The Astronomer Royal, Martin Rees, has dubbed this our final century, envisaging other means whereby human existence could end. So: would it matter?Read More »Would it be bad if humanity were to become extinct?