Topics from July 2018 How do helicopters fly? Posted by Keshav Jain on Saturday, July 28. 2018 How does a hovercraft work? Posted by Keshav Jain on Saturday, July 28. 2018 Why doesn’t a steel ship sink? Posted by Keshav Jain on Saturday, July 28. 2018 What is the difference between petrol and a diesel engine? Posted by Keshav Jain on Saturday, July 28. 2018 How do jet engines work? Posted by Keshav Jain on Saturday, July 28. 2018 How does an aeroplane fly? Posted by Keshav Jain on Saturday, July 28. 2018