All told, these studies have followed more than 55,000 people for 5 to 20 years or so.

You don't have to follow people who say I looked at the sky.

But this wasn't a situation where researchers had followed 1,000 people for 15 years to learn what worked best.

Some of downtown's business and industry followed people toward these areas.

The violence follows people to the market, to work and to school.

We're not following people around to find out how long it takes them to eat lunch.

The study followed more than 30,000 people in Norway for 11 years.

But stories that follow people into their private rooms are difficult.

They were allowed to follow people, but not to interfere.

In 1996, a team of researchers followed 18 people with arthritis for 15 months.