Category Archives: Science

Designer Babies Are at the Doorstep

A child with cystic fibrosis (CF) can look forward to a lifetime of nearly suffocating in his own mucus, probably infertility in the case of a male child, and finally death in middle age.

The disease is genetic. If you were pregnant and knew your baby was destined to struggle with CF, what would you do?

  • Have an abortion?
  • Carry the baby to term as-is?
  • Repair the defective genes so he would not develop CF?

For me, the choice would be easy. I would repair the genes.

designer-babiesThis week, news broke that scientists have managed to edit the DNA of human embryos using CRISPR-Cas9 technology, in a way that could absolutely cure CF and other diseases. (Here’s a 90-second explanation of CRISPR, and here’s one in more depth that runs 7:20.)

Not only could the technique prevent disease in an affected embryo, but the gene would forever be eliminated from the line of descent (the embryo’s children). Pretty great, right?

Yes, but the scary part is that this technique could conceivably be employed to edit any gene. You want taller children? Smarter children? Stronger children? You will be able to have them — for a price.

Continue reading

The Brief Window of Human Knowledge

al-haythamHuman science as we now recognize it began in earnest when Ibn al-Haytham, working in the 11th century, formulated the scientific method: proposing hypotheses and attempting to refute them.

The epistemological tools that al-Haytham advocated took us beyond the superstition, appeals to authority, and baseless speculation that had been the foundation of our so-called knowledge until that point.

Almost every scrap of knowledge we have that is beyond the obvious has been gathered in the thousand years since al-Haythem lived. However, in less than a tenth of that time, the window of human knowledge acquisition will close.

Continue reading

How the Pre-Scientific Mind Can Fall into Dogmatism

There is snow at the North Pole. Where there is snow, bears are white. What color are bears at the North Pole?

You probably knew how to navigate that logic before you were 10 years old. However, when researcher Alexander Luria asked Russian peasants to complete that syllogism in the 1930s, a typical response was, “Well, I’ve only seen brown bears. And only if a person came from the North Pole with testimony would I believe that the bears there are white.”

Continue reading

God versus the Multiverse

When I lost my belief in God, the near-universal reaction from my Christian friends was to sweep a hand at the marvelous world around us and say, “Where did all this come from, then?” For them, God was the only possible explanation.

The Hidden RealityAmong scientists, the hypothesis that our universe was born from a larger multiverse has steadily been gaining credence. There are several ways this could be true. As one possibility, the Big Bang could have been a quantum fluctuation in another universe, which in turn could have been born in the same way from its parent, stretching back forever. With this model, the multiverse is like an eternal froth of bubble universes. There are other models, too. I recommend Brian Greene’s book, The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos if you’re curious.

As an answer to “Where did all this come from, then?” the multiverse model may seem to be on equal footing with “God did it.” By definition, we cannot reach out and touch other universes to prove they (and therefore a multiverse) exist, much less can we prove that our universe arose from the multiverse by some natural process.

It’s true that we can neither prove that God did it, nor that the multiverse and the laws of physics did it. But as I outlined last time, just because competing explanations are uncertain does not mean they are on equal footing.

Continue reading

What Makes a Good Explanation?

Today, we all know that the Moon’s gravity causes the tides, but what did people think before Sir Isaac Newton discovered that gravity is a universal force? I recently heard Jonathan White interviewed on NPR; he is the author of Tides: The Science and Spirit of the Ocean. It turns out that serious people used to hold all manner of fanciful explanations for the tides. Three that I remember from the interview are:

  1. A woman is lifting her skirt and lowering it.
  2. A very large beast in the depths of the ocean is breathing in and out.
  3. The rays of the Moon heat rocks below the ocean, which causes the depths of the ocean to boil. Boiling in the region below the Moon causes the water level to rise.

Of course, these explanations are all wrong but some of them are better attempts at the truth than others. Put yourself in the time when the correct answer was not known. Which explanation would you prefer, and why?

Continue reading

It’s Official: My Phone Has Become My Only Brain

Last weekend, I was running an errand in Cambridge, Massachusetts. Cambridge is not an easy place to find a parking spot, so when I came across one I nabbed it.

I was in a hurry so I jogged to my destination without taking much note of what was around me. I just followed Google Maps on my phone. It turned out to be much farther than I thought — about 15 minutes at a brisk pace.

I finished my shopping and headed back to my car. There was only one problem: I was not entirely sure where it was! I headed in the general direction (at least I knew that much) and explored the unfamiliar streets of the city. They were all very quaint but as far as I was concerned one was exactly like the other.

After 20 minutes of that, I called to tell my daughter, who I was scheduled to visit that evening, that I would probably be late and might be wandering the streets of Cambridge all night.

Then I had an idea. Sammi, my Samsung Galaxy phone, had helped me out on so many occasions before. Maybe she could help now.

I pressed the button to activate voice recognition. “Where have I been today?” I asked.

Instantly, Sammi told me how to use a feature of Google Maps that I had not known about: Menu / Your Timeline. Up came a map that allowed me to retrace my drive from earlier that day. I recognized the corner where I had parked, and was at my car in two minutes.

I don’t know about you, but I plan to willingly submit to our digital overlords just as soon as they arrive.

An Upcoming Ethical Dilemma for Parents

You are standing at a fork in a trolley track, your hand on the lever that can cause the trolley to go one direction or the other. A trolley is coming toward you. If you do not pull the lever, it will go down the fork where five children are on the track. They will surely be killed. (They are tied up, or facing the wrong direction and deaf, or what have you.) If you do pull the lever, their lives will be saved, but your own child, who is immobile on the other fork, will be killed. What is the ethical thing to do?


This is possibly the earliest in a famous series of ethical dilemmas known as trolley problems.

The fun begins when we vary the scenario to tease out people’s moral intuitions. Philosopher Judith Jarvis Thompson posed the most famous version:

As before, a trolley is hurtling down a track towards five people. You are on a bridge under which it will pass, and you can stop it by putting something very heavy in front of it. As it happens, there is a very fat man next to you – your only way to stop the trolley is to push him over the bridge and onto the track, killing him to save five. Should you proceed? [quoted in Wikipedia]

Continue reading