You know that your body is made up of cells. Right? But 37 trillion of them! Who could have guessed? And now that we know, what does it really mean? How many is 37 trillion, anyway? And how did they come up with this number in the first place?
Estimate based on volume, and you get only 15 trillion cells; by weight, you get 70 trillion cells. Unfortunately, nobody has actually counted them all yet. (I wonder why?)
They divided the body into parts and estimated the number of cells in each part, from intestines to knees. This works better because cells are packed more densely in some organs than others.
The smallest cell in the human body is the sperm; the largest, the egg. The ostrich lays the largest egg of any living bird, weighing up to 3.3 lb and measuring up to 7.0 in × 5.5 in; but the largest cell on the planet is probably the egg of the whale shark, measuring up to 11.8 in × 5.5 in × 3.5 in. That’s one big cell!
But I haven’t even mentioned your microbiome yet. That consists of all the single-celled bacteria, archaea, fungi, and protists that live and make their living on and in your body. The generally accepted figure is that there are ten times more microbes living on and in you than there are of your own human cells in your own human body.
This is possible because a human cell can easily have 1,000 times the volume of a bacterial cell, for example. Again, nobody ever sat down one afternoon and counted them. It’s an estimate.
So that’s 372 trillion critters crawling, swimming, and otherwise making their ways around your body, or just sitting still. Many of them are essrntial to your own health. A few are harmful and any number of them may be neutral, neither harming or hurting you. There are so many and they are so tiny and hard to study that it’ll be a long, long time before all that gets sorted out.
So how many is 372 trillion? It’s 372,000,000,000,000. If they were minutes into the past, no animal or plant life had evolved on earth yet. Your ancestors and mine were teensy, tiny, single-celled creatures not terribly different from an amoeba.
If these 372 trillion microbes were inches, they’d reach more than half-way across the galaxy. Any way you look at it, that;s a lot of bugs! All on you.
No wonder the kakapo is the most endangered parrot in the world!
The kakapo here trying to copulate with a man’s head is Sirocco. His species of large, flightless, nocturnal, ground-dwelling parrots endemic to New Zealand is critically endangered because of humans, but not for the reason you may be thinking.
After New Zealand broke off from the supercontinent Gondwana, around 82 million years ago, any major predators on it became extinct. Among other creatures that survived were a population of parrots, which eventually evolved into several species, including the kakapo.
There were several species of hawk and an owl that occasionally preyed on the kakapo. but nothing on the ground. Even the avian predators are extinct now, except for two species of hawk. The giant Haast’s eagle died out when humans hunted its main prey, the giant moa, another flightless bird which could reach up to twelve feet tall, to extinction.
The bird was of high value to the Maori, who arrived in New Zealand in several waves of canoe voyages beginning about 1250 a.d., bringing with them the rats and other vermin that accompany humans everywhere. They hunted the birds for meat and for their beautiful feathers and sometimes kept them as pets.
Then European settlers came in the seventeenth century, bringing dogs, cats, foxes, ferrets and other beasts that go feral and devour the native fauna and flora. The flightless, ground-nesting birds didn’t have a chance!
The Europeans also hunted them for meat and kept
them as pets. One settler wrote that his kakapo’s behavior toward him and his friends was “more like that of a dog than a bird”.
New Zealand has no native non=marine mammals except bats, for the obvious reason that bats flew there and other mammals couldn’t. Why did they? I dunno. Maybe they got lost. Maybe a storm blew them off course from wherever they intended to go.
Birds often lose the power of flight and grow larger on islands with no predators to escape from, and this is what happened to the kakapo. It’s the largest parrot on earth and accumulates masses of body fat, but it didn’t need to fly until humans came with their vermin. Since there were no predators, it also nested on the ground. Big mistake!
After the Polynesian and European colonizations, the kakapo was almost wiped out. Now, all surviving kakapos are kept on three predator-free islands, where they are closely monitored. Two large islands have been the subject of large-scale ecological restoration to create self-sustaining ecosystems with suitable habitats for the kakapo. As of April 2018, there were 149 known adult kakapos.
The “Tree of Life,” which shows relationships among all forms of life to the extent we know them, is no longer a tree. It has taken the form of an arc with many thick branches. On seeing it depicted this way, one is inclined to remember Charles Darwin’s words:
It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other, and dependent on each other in so complex a manner, have all been produced by laws acting around us (the laws of nature).
On the Origin of Species (First Edition), by Charles Darwin
The hair and clothes in the left image appear to be white whereas those in the right image to be black, though they are the same luminance. This phenomenon is called “lightness constancy”. pic.twitter.com/wOmlEzPoxQ
Believe it or not, the hair and the clothes in the two images are exactly the same shade of gray. Primarily, only the backgrounds are different, and that makes the foregrounds appear different in your own brain. The skin coloring is a little different, too; but I’m not sure why. It doesn’t seem significant.
The point is that you should always be skeptical, even of what you see with your own eyes.
Penicillin was discovered in 1928 by Scottish scientist Alexander Fleming and used to treat the first patient in 1942, for streptococcal septicemia. Half of the total world supply at that time was used on that one patient.
In 1943, a worldwide search for the best strain of penicillin mold selected one found growing in a moldy cantaloupe in a grocery store in Peoria, IL. By the spring of 1944, the United States had produced 2.3 million doses, using mold sourced from that melon, in time for the invasion of Normandy.
During World War II, chemists cultured molds in pans and stacked them floor to ceiling in many labs to produce tiny amounts of penicillin, the only known antibiotic at that time. In spite of all they could do, it remained in such short supply that unmetabolized remnants of it were recycled from soldiers’ urine.
This 3D model of a penicillin molecule was made by Dorothy M Crowfoot Hodgkin, in England, in 1945, by interpreting patterns refracted by x-rays, known as x-ray crystallography. Having this model made it possible for John Sheehan at MIT to devise a method for synthesizing the antibiotic in 1957.
Hodgkin won the Nobel Prize for Chemistry in 1964 “for her determinations by X-ray techniques of the structures of important biochemical substances”.
I’ve posted before about whales and dolphins who needed help and who sometimes even seemed to ask for it. And say thank you. Now it’s the lady scientist who needs help, only she doesn’t know it yet. A giant whale probably saves her life, because he knows something she doesn’t. She’s being stalked by a huge shark!
Certainly a scary experience, but fantastic!!! Something she can tell her grandchildren about!
“When the aging gorilla is confronted with the much more virile, new alpha-male, he shows submissiveness by grooming the alpha-male, but the gesture is actually a vain attempt by the old gorilla to humiliate his much younger rival.”