Shh...hedgehog! It always feels like a privilege to catch a glimpse of one, as it snuffles away under the garden fence. And come the spring, our spiny - and usually solitary - little friends will be feeling in the mood for...romance. But what exactly does a female look for in a mate? And how do their intimate encounters even work when things are so very... spiky? Join us for this special Valentine's Day edition of the Big Questions Podcast, as we ask Dr Sophie Lund Rasmussen (aka Dr Hedgehog) "how horny are hedgehogs?"

Electric eels are pretty amazing creatures. Their bodies can release powerful electric charges - in some cases reaching 650 volts! So, what can scientists learn from these animals? Could nature hold the key to advancing our own energy solutions? We chat to Dr Yujia Zhang about how electric eels might inspire the batteries of the future.

Whether it's the bottle of water that you hastily grab at the train station, or your favourite guilty-pleasure fizzy pop, you may have noticed something different about your drinks lately - or at least their containers. Since July 2024, it's been EU law that bottle caps are attached, or 'tethered', on all single-use plastic bottles. But what exactly is the reason for this change? Will it really help to save the planet, or is it just there to annoy us? We chat to Dr Diogo Veríssimo about "nudge", "sludge", and changing human behaviour for a better world.