Spot the man made fakery from the bizarre but real. For April Fools Day Oobject becomes Zoobject and is all about animals rather than machines, with a cunning cryptozoology quiz. Vote for your faves and click to see which are real or fake.

Giant centrifuges are used to test whether fighter pilots or astronauts can deal with extreme G forces, pilots having 3 chances to survive a 15 second 6G test to be able to qualify. Here are some videos of the results of the effects of these tests up to 10G and on a range of suspects from pilots to Iron Maiden's lead singer.

Until very recently, people still used the same principal that Newton had proposed, to derive latitude from the angle of the sun or stars at known times. The sextant (or originally octant) allowed people to do this relative to the horizon, rather than the instrument itself.Later versions of the sextant included a very simple version for emergency use, called the Bris sextant (not a great name for a device to be used on a rolling ship) and until the advent of GPS systems, bubble sextants were used on aircraft.

Airstream was neither the first nor the only manufacturer of streamlined trailers with examples shown here, by Spartan, Silver Streak, Westcraft and Bowlus, among others, yet they are deservedly the best known and continue to thrive. Because of their futuristic design they have a unique place in the history of technology. An Airstream was used for quarantine after the first men returned from the moon and today takes astronauts to the Space Shuttle. Their iconic silver bullet shape still looks modern, yet it dates from the 30s and is based upon a prior streamline designed trailer, called the Bowlus. Here is a list of some of the most beautiful things to have ever been on the roads.

The Wall of Death ride, where centrifugal (or counter-centripetal as physicists tell us we are supposed to say) force allows a motorbike rider to circle a vertical wall is an iconic daredevil attraction that has been preserved by a few dedicated enthusiasts. Traditionally a wooden cylinder provided the circuit for a classic Indian motorcycle, however vehicles such as cars and go carts have been used in tracks that are now often spherical cages.