TechKnow explores how the latest scientific discoveries around the globe are changing our lives.

The human heart beats 100,000 times a day, more than 2,5 billion times in a lifetime. It pumps about five litres of blood a minute or about 7,500 litres every day - the equivalent of filling up an SUV's gas tank 100 times a day.

I view the study as hopeful but I am cautiously hopeful. I for one have not seen any study to date that shows these dramatic changes in the thickening of the heart and the appearance of heart muscle cells.

Jamil Aboulhosn, cardiologist at UCLA

But the human heart is also a machine that is not built to last. In the US alone, more than 600,000 people die from heart disease every year.

This week, contributor Kyle Hill meets two dedicated scientists whose journey has led to a groundbreaking discovery. GDF 11, a protein discovered in mice by doctors at Harvard University, has been proven to turn back the cardiac clock and make an old heart young again.

In western Montana, Rachelle Oldmixon takes us on a trip to Glacier National Park which is experiencing global warming at an alarming rate.

The area is warming at two to three times the global average, and climate change is affecting the Pacific fish, the Cutthroat Trout, which is the mainstay of the economy there.

Rachelle explores the threats facing trout in the area and finds out what ecologists are doing to fix the problem.

San Francisco, California is an earthquake-prone area. Engineers there are now developing new technologies that create structures that could abrsorb the impact of an earthquake, while leaving the rest of the structure in-tact.

The technology was inspired by car crash crumple zones, a safety feature, often at the front of a car. And the idea has inspired engineers to design the world's widest bridge with sections that could absorb earthquake damage.

Marita Davison goes inside the San Francisco-Oakland Bay Bridge and also looks at an office building using similar seismic innovations.

TechKnow can be seen each week at the following times GMT: Friday: 1930; Saturday: 1430; Sunday: 0430; Monday: 1630.

Click here for more TechKnow

Source: Al Jazeera