Pregnancy trimesters: A guide

The typical pregnancy has three trimesters and lasts around 40 weeks from the first day of a woman’s last period. In each trimester, the fetus will meet specific developmental milestones. While 40 weeks is the usual time frame, a full-term baby can be born as early as 37 weeks and as late as 42 weeks.…

Details

Making Jewelry, She Realized She’d Never Been Happier

NAME Zena Haddad AGE 45 HOMETOWN Beirut, Lebanon, where Ms. Haddad lived for the first three months of her life, and Abu Dhabi, United Arab Emirates, where she grew up until she left for a British boarding school at the age of 9. NOW LIVES In the Mayfair neighborhood of London. BACKGROUND Ms. Haddad took…

Details

A Conversation With: Steven Pinker Thinks the Future Is Looking Bright

Steven Pinker, a cognitive psychologist at Harvard, has been known to take provocative positions. He has argued that women are intrinsically different from men, that we are more driven by our genes than academics like to acknowledge, and that society is getting less violent over time — despite the mass shootings and other atrocities we…

Details

11 THINGS We’d Really like to know: How Can We Unleash the Immune System?

Cancer has an insidious talent for evading the natural defenses that should destroy it. What if we could find ways to help the immune system fight back? It has begun to happen. The growing field of immunotherapy is profoundly changing cancer treatment and has rescued many people with advanced malignancies that not long ago would…

Details

11 Things We’d Really Like to Know: How Long Can People Live?

The most common risk factor for serious disease is old age. Heart disease, cancer, stroke, neurological conditions, diabetes — all increase radically with advancing years. And the older a person is, the more likely he or she is to have multiple chronic illnesses. Some scientists hope one day to treat all of them at once…

Details

11 Things We’d Really Like to Know: Why Are We Still So Fat?

Whenever I see a photo from the 1960s or 1970s, I am startled. It’s not the clothes. It’s not the hair. It’s the bodies. So many people were skinny. In 1976, 15 percent of American adults were obese. Now the it’s nearly 40 percent. No one really knows why bodies have changed so much. Scientists…

Details

Global Health: Why Don’t We Have Vaccines Against Everything?

Vaccines are among the most ingenious of inventions, and among the most maddening. Some global killers, like smallpox and polio, have been totally or nearly eradicated by products made with methods dating back to Louis Pasteur. Others, like malaria and H.I.V., utterly frustrate scientists to this day, despite astonishing new weapons like gene-editing. We have…

Details