Have we become too clean for our own good? Medical researchers suggest the war against germs in the hygiene-obsessed western world may be triggering serious illnesses in hundreds of millions of people. Unless we stop attempting to live in a sterile biological exclusion zone, we may prove to be our own worst enemies.

Dubbed “the bridge that couldn’t be built”, eighteen years, eleven deaths and an engineering revolution later, it stunned the world. Ever prone to climate extremes, this is the story, not of its making, but of its redesign – to withstand the incredible forces of an earthquake. Join the engineers as they embark on a race against time to save the bridge.

Building the Biggest charts the race to build the world’s tallest skyscraper, biggest cruise ship and largest passenger plane. Set against a compelling history of engineering, the series places each project in its scientific and cultural context. With extraordinary behind the scenes access, the programmes bring alive these larger-than-life quests in rich and breathtaking detail.

Using dynamic experiential visuals with fascinating facts and figures we’ll reveal the serious science of Interstate building. We’ll pour asphalt on I-35 where it's 115° F in the shade, inject liquid nitrogen to cool curing concrete, lay rebars for bridges south of Chicago and hoist a 40-ton piece of steel to build a new ramp.

The pilots of The USS Enterprise have seen heavy action in Iraq and Afghanistan, and now, finally, are returning home. We go aboard to deconstruct how a carrier works in wartime, with amazing personal stories and real-time footage from missions we reveal the awesome power of what’s often called the most dangerous place on the planet: a major aircraft carrier.

Niagara Falls. Seventeen stories tall with currents racing 40 kilometres per hour and dumping two million litres of water per second. Since the 19th century, people have gone over the edge in custom-built barrels. What drives them? Who survived, who didn't, and why? Hold on as we meet the adventurous, the daring, and the crazy in Challenging Niagara.

The Dragon and Tiger economies of Asia have roared onto the world stage. As they power through their own industrial revolutions, it seems they are about to wreak untold damage on our climate. With over half the world’s population living in the polluted cities of Asia – it is here that the battle against global warming is at its most urgent.

Chemical warfare may be rare among humankind, but is an every day part of nature. This is the story of unusual and rarely seen uses of venom and poisons, both as weapons of attack and defence. It features the deadly blue ringed octopus, American rattlesnakes, and the New Zealand jumping spider.

In 2008, China’s monster quake claimed 80,000 lives and destroyed five million buildings. In 2009 an international team of earthquake scientists head into the heart of China to decode the disaster. Their quest - search the rubble for vital clues to understand the earthquake, and make groundbreaking discoveries that will save lives in the future, wherever and whenever killer quakes strike.