How Do They Do It? Season 15 Episode release dates & where to watch

1. Harris Tweed, Turntables, Fermented Shark

How do the islanders of the Outer Hebrides use pedal power to weave world-famous Harris tweed? And, in Iceland, how do they prepare fermented shark?

2. Beds-Hastens, Satellites, Indoor Salads

How do they make the world's most expensive and luxurious beds? And, how do they deliver supplies and equipment to the International Space Station?

3. Borsalino Hats, Folding Bicycle

How do they make the distinctive Borsalino hat worn by Indiana Jones? And, how do they make a bicycle which can fold up to a tenth the size of a...

4. Fender Stratocaster • Kalles Kaviar • Endurance Racing

How do they make the world's most famous electric guitar, the Fender Stratocaster? How do they a Swedish delicacy from fermented cod roe? And what are the secrets behind prepping for of the world's most grueling sports?

5. Pisa's Leaning Tower, Eider Down, Chocolate Digestive

It's been tipping over for 800 years - what's the gravity-defying magic behind Pisa's leaning tower? And, how are chocolate digestive biscuits manufactured?

6. Parchment, Shuttlecocks, Salt

How did the ancient Greeks invent parchment with techniques still used today? And how do they make shuttlecocks, the fasting moving object in sport?

7. Ballpoint Pens, Pizza, Reed Rugs

How do they make some world's smoothest writing ballpoint pens that don't leak or fade? And, how do they make pizza for soldiers on the frontline?

8. Violins, Milk Delivery, Volcanic Rock Houses

In Cremona, how do they make modern violins that sound as good as the legendary Stradivarius? And, how do they build houses with volcanic rock?

9. Fastest Superyachts, Space Suit, Katsuabushi

How does a Dutch company make the world's fastest superyachts? And, how do they make a new space suit that weighs and costs the fifth of the previous design?

10. Parma Ham, Rowing Machines, London Underground Signs

How is Parma ham, the most famous ham in the world, made? Plus, how do they make rowing machines, and how are the iconic London Underground signs made?

11. Beach Landing Planes, Tomatoes, Bavarian Lederhosen

How do planes take off and land on a beach at one of the world's oldest airports? And, how do they hand-make the national dress of Bavaria, lederhosen?

12. Lobsters, Chesterfield Sofas, 4K Television

How do they catch the world's largest lobsters? How do they build the iconic chesterfield sofa? And, how do they capture the world's sharpest TV pictures?

13. Car Weather Factory • Baseball Gloves • Christmas Puddings

How do they take a car from Siberia to the Sahara without leaving Germany? How do they hand craft a baseball glove that will last a lifetime? And how do they keep alive a Christmas tradition that's more than 300 years old?

14. Print Newspapers • Knitting Socks • Ribena

How do they print over 10 million copies a day of the world's best-selling newspaper? How do they knit 32,000 pairs of socks a day at South Africa's biggest sock...

15. Raisins, Showers, Papyrus

How do they produce 99% of America's raisins in California's San Joaquin Valley? Plus, how do they make the world's oldest type of paper?

16. Charcoal Briquettes, Soba Noodles, Vaulting Poles

How do they use ancient techniques and modern technology to produce thousands of tonnes of barbecue charcoal? How do they cook up Japan's soba noodles?

17. Freshwater Pearls, Knives, Hippo Roller

How do they grow America's only freshwater pearls in Tennessee? How are the world's sharpest knives made, and how do they forge the world's sharpest knives?

18. Sugar, Feather Dusters, Balloons

How do they turn ugly root vegetables into sweet sugar? How do they make feather dusters? And, how do they make billions of balloons to keep parties popping?

19. Pencils, Liquorice, Lace

How do they turn trees into billions of pencils? How do they make liquorice? And, how do they use traditional techniques to weave the world's most fashionable lace?

20. Platinum, Manga Comics, Limoncello Finale

How do they mine one of the world's most valuable metals, platinum? How do they produce manga comics? How do they turn lemons into an Italian after-dinner drinks?