At their most abstract level, the logic gates that make up a digital computer are machines for destroying information. That might not be immediately apparent, but take a look at this (image from Wikipedia):
Two inputs; one output. At every operation, one bit of information is lost forever in an irreversible process. Continue reading
Today is my birthday, and at this age, I am three times as old as my elder son, and four times the age of my younger. My elder son is four years older than his younger brother. Can you tell how old I am? Continue reading
My all-time favourite scientist was Isaac Newton. Newton was very clever. In fact he was a genius. He discovered lots of interesting and important things. Unfortunately, most of them turned out to be wrong. That doesn’t make him a bad scientist, of course. Finding wrong answers is an important way that science makes progress.
One of the reasons we know that Newton was a genius is that it took a very long time before anyone proved that he was wrong. Around 200 years, in fact. Then Albert Einstein (my second favourite scientist) showed that Newton was wrong, by coming up with some better explanations. Continue reading
Indulge me in a little thought experiment. Imagine a rocky planet a long way from here, orbiting a star rather similar to our own sun, at just the right distance for water to remain liquid. Let this planet have an atmosphere containing all the elements needed for interesting biochemistry to take place – carbon, hydrogen, oxygen, nitrogen, phosphorus, sulphur and so on. Now imagine that on this planet lives a single lifeform – one composed of trillions of tiny plant-like organisms amassed in one huge layer that covers the entire planet. This lifeform quietly converts the sun’s energy into food, and while it does so, it thinks. What kinds of thoughts might it ponder? Continue reading
The iPhone is perhaps the ultimate symbol of 21st-century technology. How peculiar then, that the Apple website gives its size in inches and its weight in ounces – units of measurement that the Victorians would have heartily approved of, over a century ago. How odd too, that in the United States, oil is measured in barrels, land in acres and temperature in Fahrenheit. Continue reading
We start out in life without any knowledge, but it’s not long before we start forming simple opinions about the world we find ourselves in. We might call these preferences (I like milk). These probably change over time (I like beer) but they are inherently subjective and cannot be exposed to objective scrutiny (my daddy is better than yours), at least not in a meaningful way (no he isn’t.) We think of these preferences as conscious choices, but we are really just observing what we like and don’t like. Continue reading
This is how I plan to write my blog in future. I will keep this little guy in my basement and supply him with bananas until he produces an article I’m happy with. It’s a great method if you’re lazy but patient.
But how patient would I have to be? How long would it actually take? Continue reading