Emest Owusu was 13 in 1980 when he was given the opportunity to appear in the audience of a BBC show, and ask Thatcher how she felt about being called the Iron Lady. This encounter re-emerged in a BBC’s programme recently.

At the time of their meeting, Owusu was on free school meals, living on a public estate in Brixton, south London, where he and his sister were being raised by their mother Rose, a struggling hairdresser.

Now 57, Owusu looks remarkably similar even with a greying beard. But his life has been transformed. The father of three is a human resources director, and the first black captain of the Addington golf club in its 110-year history. As a black guy, it is about breaking the glass ceiling.

Speaking in its clubhouse, Owusu describes his rise in social status (地位) as a “Thatcherite Journey”. And he says it began by asking the woman herself. “To this day it still has an impact. My confidence changed from that sliding-door moment. Something about her connected with me.”

Thatcher told Owusu she enjoyed being called the Iron Lady. “I think it’s rather a praise, don’t you?” she said, “Because so often people have said to me if you’re in your job you’ve got to be soft and warm and human, but you’ve got to have a touch of steel.” Owusu recalls the moment, “I just remember her eye contact. She was answering me, not the camera. She welcomed the question saying you’ve got to be firm in this world. And that stuck with me.”

After the show was broadcast, Owusu said he became “a little hero in Brixton for a good three months”. Owusu added, “It all gave me extra confidence. Doors might not have opened so quickly. It was one of those key moments to make you do things maybe you wouldn’t otherwise have done.”

Any schoolchild knows that a whale breathes through its blowhole. Fewer know that a blowhole is a nostril (鼻孔) slightly changed by evolution into a form more useful for a mammal that spends its life at sea. And only a dedicated expert would know that while toothed whales, such as sperm whales, have one hole, baleen (鲸须) whales, such as humpback and Rice whales, have two.

Even among the baleen whales, the placing of those nostrils differs. In some species they are close together. In others, they are much further apart. In a paper published in Biology Letters Conor Ryan, a marine biologist at the Scottish Association for Marine Science, suggests why that might be. Having two nostrils, he argues, helps whales smell in stereo (立体空间).

Many types of baleen whales eat tiny animals known as zooplankton (浮游动物), which they catch by filtering (过滤) them from seawater using the sheets of fibrous baleen that have replaced teeth in their mouths. But to eat something you first have to find it. Toothed whales do not hunt by scent. In fact, the olfactory bulb—the part of the brain that processes smell—is absent in such creatures. But baleen whales still have olfactory bulbs, which suggests smell remains important. And scent can indeed give zooplankton away. Zooplankton like to eat other tiny creatures called phytoplankton (浮游植物). When these are under attack, they release a special gas called dimethyl sulphide, which in turn attracts baleen whales.

Most animals have stereoscopic senses. Having two eyes, for instance, allows an animal to compare the images from each in order to perceive depth. Having two ears lets them locate the direction from which a sound is coming. Dr Ryan theorized that paired blowholes might bring baleen whales the same sorts of benefits.

The farther apart the sensory organs are, the more information can be extracted by the animal that bears them. The researchers used drones to photograph the nostrils of 143 whales belonging to 14 different species. Sure enough, baleen whales that often eat zooplankton, such as the North Atlantic right whale, have nostrils that are farther apart than do those, such as humpback whales, that eat zooplankton occasionally. Besides allowing them to breathe, it seems that some whales use their blowholes to determine in which direction dinner lies.