Dallas attempts to find out what causes tooth decay and gum disease. Yan explains the reason why refreezing food is not a good idea. Jem takes a look at some new research that claims electric lights can play havoc with the way we sleep.

Liz investigates an increasingly common and unwelcome guest - the bedbug. Meanwhile, Yan explains why statistics are not to be trusted, and Dallas goes stargazing in California.

Jem Stansfield witnesses the power of rockets as he spends time with the team working on the Bloodhound land-speed record project. Dr Yan Wong re-creates an ancient Greek experiment to measure Earth's circumference with two sticks, and Dallas Campbell goes in search of a robot he can call his own.

In the second episode of the science series, Liz hits the beach with the RNLI to experience the power of rip currents; Dr Yan attempts to demonstrate evolution by drawing a couple of lines; and Jem is back in the workshop, turning everyday scrap into gold.

Liz looks at the controversial science of genetically modified crops in Hawaii. Dallas tries to remedy Jem's dust allergy by making him eat worms. And Dr Yan tries to shatter a glass by playing the violin.

Jem Stansfield explains lasers on the 50th anniversary of their invention, Dallas takes part in a Citizen Science experiment and Dr. Yan calculates the speed of light.

Jem explains what a calorie is by making the rest of the gang take part in the Oxford and Cambridge Boat Race. Yan is at the Houses of Parliament to test the ability of MPs to calculate risk. Liz attempts to find out why effective antibiotics are in short supply.

In the second episode of the series, Liz follows two couples undertaking IVF and looks at the new research that may dramatically increase success rates. Jem attempts to become the first man to go 360 degrees on a playground swing. And Dr Yan confuses shoppers with the help of a very special mirror.

Jem Stansfield puts spider silk - the strongest material in the natural world - to the test; Liz Bonnin joins the RAF's flight school to find out the truth about multi-tasking; Dr Yan Wong experiments with sodium acetate; and Dallas Campbell dusts off his top hat to reveal the secret science of magic.

Liz Bonnin explains how cells turn cancerous by blowing high-tech bubbles.

The team looks at some of the biggest travel nightmares. Liz investigates what causes traffic jams, whether lane switching works, and how to beat travel sickness. Meanwhile Jem heads for his workshop to build his own solution to traffic jams: a home-made, man-powered aeroplane.

Dallas takes on the latest lie detection technology, while Liz looks at the dilemma that threatened to undermine her hero Charles Darwin. Jem faces his toughest challenge yet, to build a human-powered hydrofoil, and Dr Yan gets on the 3D bandwagon.

Jem faces his toughest challenge yet: to build a boat made out of ice, and take it and the rest of the team for a spin in one of the UK's busiest stretches of water. Dallas investigates the world of comets and tries to build his own, while Liz looks at the science behind hypothermia and gets repeatedly dunked into ice-cold water in preparation for the ice boat extravaganza.

In this second episode of the series, the team take on more scientific challenges. Engineer Jem Stansfield designs, builds and then puts his life in his hands by tying himself to a water jet pack. Zoologist Liz Bonnin finds out if insects are the future of food, science-mad Dallas Campbell investigates NASA's latest attempts to prove there is life beyond Earth, and roving reporter Dr Yan Wong challenges the people of Cambridge to blow up a bin liner.

From food-fraud to flu, from plastics to poisons, and from superbugs to sugar, TV science legend Maggie Philbin joins presenters Liz Bonnin and Jem Stansfield as the team investigate the science that makes sense of the stories that affect us all.

The team look at some of the things threatening the safety of your family on a daily basis. Liz finds out why old and very young pedestrians may never be safe crossing the road; on the anniversary of Fabrice Muamba's miraculous survival following a heart attack playing for Bolton Wanderers, Maggie asks how many young people could be carrying a similar time-bomb, and how science can help them; Maggie also investigates a revolutionary new burns dressing that could drastically reduce the risk of scarring; and Jem turns crash-test dummy as he asks why European legislation is preparing to make rear-facing seats compulsory for more children.

In the latest of the series that puts science to the test, the team takes on more fun experiments and challenges. Dallas Campbell traces the incredible global journey of 30,000 indestructible plastic ducks, while Liz Bonnin goes on manoeuvres at the bottom of the Baltic Sea in the Royal Navy's latest search and rescue sub. Dr Yan Wong challenges the people of Cardiff to take on the might of friction, and Jem Stansfield uses two domestic vacuum cleaners to climb up the side of a building.

In this episode, the team look at Britain under pressure. With the population of the UK topping 63 million, what are scientists and engineers doing to reduce the strain on our ageing infrastructure? Maggie heads 50 metres beneath the River Thames to see how the UK's biggest ever water engineering project aims to prevent raw sewage flowing into the Thames every time heavy rain overwhelms London's sewers; Liz explores the possibilities of urban underground farming, and also finds out how engineers protect us from smells like landfill; while Jem investigates a new idea that could help to tackle the problem of overcrowded graveyards.

Dallas hits the streets to discover what makes us happy, while Liz travels to Norway to investigate the latest technology to combat climate change. Jem puts himself in harm's way in avalanche country, and Dr Yan sets an optical illusion challenge to a WI meeting.

The team asks whether modern life is damaging our ears. Dallas explores how safety-conscious scientists are putting the noise back into driving, Liz learns to like the sound of being sick, and Jem sets out to record the sound of a centipede's footsteps.

The team investigate the ill effects of old age, from weakened bones to dementia.

The team look at measures engineers take to ensure Britain's rail system stays on track.