Scientists revealed new data this week about how - and why - Mount Everest has been getting taller for the past 90,000 years. Guest: Dr Jonathan Webb, ABC Science Editor Brainteaser (answer in the audio): A monk walks up a mountain path to the summit. He sets off at 8am and arrives at 8pm, before walking back the next day - again setting off at 8am and reaching the bottom at 8pm. He walks at varying speeds and takes multiple breaks. Is there point on the path that he will pass at the same time on both days?   For more of the latest science news, look for the science section on the ABC News website and sign up to a weekly email newsletter.