9. Some pedestrian crossings have a hidden knob and do you know what its purpose is?
The knob was invented for people with visual or hearing disabilities and it informs them that now it is safe for them to cross. These knobs still exists in UK.
10. Do you know beer bottles have a long and slender neck?
The long neck of the bottle is to keep it away from body heat warming the beer. The person can take few sips of it and hold it by its neck.