Count down the world of transport with an amazing mix of numbers, facts and statistics! Do you know how fast a space rocket blasts through the sky? Or how deep under the sea submarines have ventured? How about the number of electric cars on the road? Or the top speed of NASA's crawler transporter (hint - it's not very fast!) Discover the answers to all these questions and much more in Big Countdown: Transport. The Big Countdown looks at popular topics and investigates the great many numbers that make them fascinating. From the mind-bogglingly large to smallest and most precious, this series helps us understand that it's not just our days that are numbered. Ideal reading for number-crunchers aged 9 and up.