Skip to Content
Uncategorized

When Does Life Begin?

There was an interesting exchange in the stem cell debate earlier this week between Harvard biologist George Daley and Senator Sam Brownback on when a human embryo acquires moral rights. According to Wired News, Brownback “persistently” asked Daley at what…
October 1, 2004

There was an interesting exchange in the stem cell debate earlier this week between Harvard biologist George Daley and Senator Sam Brownback on when a human embryo acquires moral rights. According to Wired News, Brownback “persistently” asked Daley at what age he would decline to use an embryo for medical research. Wisely, Daley said he could not define when an embryo becomes a human being. “I think there would be consensus among scientists that it would be impossible to define that time,” Daley said. “But I don’t think it’s at the age of the blastocyst.”

Wired writes:

Brownback pressed further, asking him to envision his two children and determine at which point in their development it would be OK for scientists to perform research on them. “I can’t hug an embryo,” Daley said. “I think (scientists) are comfortable with using the earliest microscopic ball of cells.”

Of course I don’t have an answer either–or at least one that will convince the Brownbacks of the world–but it’s always seemed to me that the development of a nervous system ought to be involved. The “primitive streak,” from which the central nervous system eventually develops, begins to appear at about 14 days after fertilization when the embryo consists of about 2000 cells–significantly later than the 100-cell blastocysts Daley is talking about.

Deep Dive

Uncategorized

Our best illustrations of 2022

Our artists’ thought-provoking, playful creations bring our stories to life, often saying more with an image than words ever could.

How CRISPR is making farmed animals bigger, stronger, and healthier

These gene-edited fish, pigs, and other animals could soon be on the menu.

The Download: the Saudi sci-fi megacity, and sleeping babies’ brains

This is today’s edition of The Download, our weekday newsletter that provides a daily dose of what’s going on in the world of technology. These exclusive satellite images show Saudi Arabia’s sci-fi megacity is well underway In early 2021, Crown Prince Mohammed bin Salman of Saudi Arabia announced The Line: a “civilizational revolution” that would house up…

10 Breakthrough Technologies 2023

Every year, we pick the 10 technologies that matter the most right now. We look for advances that will have a big impact on our lives and break down why they matter.

Stay connected

Illustration by Rose Wong

Get the latest updates from
MIT Technology Review

Discover special offers, top stories, upcoming events, and more.

Thank you for submitting your email!

Explore more newsletters

It looks like something went wrong.

We’re having trouble saving your preferences. Try refreshing this page and updating them one more time. If you continue to get this message, reach out to us at customer-service@technologyreview.com with a list of newsletters you’d like to receive.