Author: BBC World Service

Host Anand Jagatia tackles gravity - a fundamental force of the universe yet also an everyday mystery that has baffled several listeners. Can you outrun it? Or at least use it to get fitter? If it varies, does that mean that you weigh less, depending on where on earth you stand? And if it’s the force of attraction between any objects with mass, are you technically more attractive after eating a massive cake?

Professor Claudia de Rham from Imperial College London explains the basics of gravity, while we discover the best place on earth to weight ourselves, with Professor Paddy Regan from Surrey University and NPL Fellow in Nuclear and Radiation Science and Metrology.

Anand takes a very fast spin on a special chair to experience extra gravity, thanks to Professor Floris Wuyts from the University of Antwerp, Kings College London and Minister of Science of Asgardia.

And finally, we talk to an expert lined up at the other end of a hypothetical hole through the earth: Professor Richard Easther from the University of Auckland, New Zealand. What would happen if we fell straight through the earth?

CrowdScience finds gravity a force to be reckoned with.

Presenter: Anand Jagatia Producer: Marnie Chesterton Editor: Cathy Edwards Production Co-ordinator: Ishmael Soriano and Jana Bennett-Holesworth Studio Manager: Jackie Margerum and Duncan Hannant Photo: Anand Jagatia experiencing extra g-force

April 1st is notorious across the globe. Renowned for being a day of practical jokes. And it’s no different here on the BBC World Service.

Mischievous elephants, the secret to fool's gold and one of the biggest scientific hoaxes in scientific history.

From the Magic Circle to the Magic Lab, the psychology underpinning why we humans are so delightfully easy to trick with Professor Gustav Kuhn.

And a question sent in from one of you: if two people eat the same thing for breakfast, does the same thing come out the other end of both of them?

Prepare for a prank or two on Unexpected Elements.

Or as they say in Finland, ‘Aprillia, syö silliä, juo kuravettä päälle’, which translates to ‘April trick, eat herring, drink muddy water afterwards!’

Presenters: Caroline Steel with Camilla Mota and Phillys Mwatee Producers: Harrison Lewis, Alice Lipscombe-Southwell, William Hornbrook and Imaan Moin

This week, after five years of research, two newly discovered antiviral molecules have been shown to combat coronaviruses. Johan Neyts of the Rega Institute for Medical Research in Leuven outlines how he hopes the new molecule developed by his team might help us deal with emerging pandemics in the future.

But as the US halts all Covid related research, will drugs like these ever hit the shelves? Among the grants terminated this week by the National Institute for Health is a programme called AViDD, AntiViral Drug Discovery, supporting 9 independent consortia. Annette von Delft of Oxford University and Ed Griffen of the drugs discovery company MedChemica spoke to us about the overnight shut down of years of work and importance of antiviral development.

The longest ever carbon-based molecules have been discovered by the Mars Curiosity rover. Caroline Freissinet of the Laboratoire Atmosphères et Observations Spatiales talked us through the meticulous planning and geological chance that made this possible, and whether these long chain alkanes could be a clue to discovering life on mars.

Researchers at Vanderbilt University have been delving into the genetic evolution of horses to discover the mutation that’s behind their runaway metabolic success. Gianni Castiglione explains how a mutation that should have been catastrophic instead helped horses to evolve from the size of dogs to the giant athletic animals we know today.

Presenter: Roland Pease Producer: Emily Bird Production Coordinators: Jana Bennett-Holesworth and Josie Hardy

(Photo: Two tablets of Roche Pharmaceuticals' Tamiflu. Photo by Nikos Pekiaridis/NurPhoto via Getty Images)