内容摘要：ot days can feel unbearable without a strong air-conditioning system. Yet many of us take these essential devices for granted. “The only time people pay attention to their air conditioner is when it's not working,” says Jeffrey Siegel, a professor of civil engineering at the University of Toronto who researches ventilation and indoor air quality.

ot days can feel unbearable without a strong air-conditioning system. Yet many of us take these essential devices for granted. “The only time people pay attention to their air conditioner is when it's not working,” says Jeffrey Siegel, a professor of civil engineering at the University of Toronto who researches ventilation and indoor air quality.

A seminal moment came when she was 16, and she had found her sport. "I want to play golf," she told her parents."I don't think I really knew where the golf would take me," she says. "It was more just kind of a hobby. I enjoyed playing. And then I got a little better. And then I played some tournaments. And then one thing kind of led to another."

It’s a process she started over again when her kids were very young and they traveled with her to golf events."They probably thought that was work," Sorenstam says, "and that's not what they wanted to do."These can be delicate times with our kids and their sports. We can teach lessons on grip, ball position and aim by sprinkling them in while playing with friends ("It's very convincing when friends play a certain sport," she says) or having putting competitions.

"I am a big believer in understanding the fundamentals of the sport early on," Sorenstam says, "and then just let them learn and let them test."We don’t always have to emphasize drilling. We can take breaks, she says, to stack golf balls into pyramids or

"Introduce them to the game so it doesn't become so focused on golf and having to do everything perfectly," she says. "I think that's when you lose your kid early, because it's all this structure. There's a fine line of having structure. There's a fine line of having etiquette. And I think you have to find that balance.

"When your kid leaves the golf course or the driving range you want them to have a smile on their face. Then I think you've been successful."U.S. steel firms have hailed Trump’s renewed push to raise the cost to American firms that rely on imports of steel. It’s a notably favorable reaction to tariffs amid what has broadly been a backlash against them.

"American-made steel is at the heart of President Trump’s plan to revitalize domestic manufacturing and return our country to an economic powerhouse," the Steel Manufacturers Association said in a statement that applauded Trump’s remarks about the new 50% tariffs.Investors have rewarded the steel firms accordingly,

Today, the steel manufacturing industry directly. It's a fraction of the half million-strong workforce the industry counted in the decade after World War II, though employment levels have stabilized more recently.