He says looking back thousands of years can help researchers look forward by understanding how a disease changed over time.

VOA: special.2010.06.29

As Andrew Johnson prepared to leave the White House a few months after Grant's election, he would look back on some successes during his time as president.

VOA: special.2010.02.11

But he also gave me a heart, so I would look back."

VOA: special.2010.07.05

He gave Smiley a look that said he was sorry for fighting a dog that did not have any back legs for him to hold, which he needed to win a fight.

VOA: special.2009.08.29

Ruhli,who is a medical doctor as well as a paleo-pathologist, says looking back can help scientists look forward, by revealing how the disease evolved over time.

VOA: standard.2010.05.05

We have a monumental task ahead of us. And there's not a second to look back to our yesterdays, to look back at our fears and frustrations.

VOA: standard.2010.05.17

"So I urged these institutions here today to go back and take a third and fourth look about how they are operating when it comes to small business and medium sized business lending,"

VOA: standard.2009.12.20

"Clearly with the economy around the world growing again, passenger traffic coming back, cargo traffic coming back, we're in a much better position today than we were last year and as we look forward, we're very optimistic about the future."

VOA: standard.2010.07.23