1. Incandescent
2. Halogen
3. Fluorescent
4. Compact Fluorescent
5. High-Intesity Discharge
6. Low-Pressure Sodium
7. LED

1. Stereophonics
2. Billy Joel
3. Desperate Housewives
4. Guns 'n' Roses
5. England 2018 Official World Cup Bid
6. Only Fools and Horses
7. Sleeping in Tents

Janka hardness measures the force required to embed an 11.28 mm (0.444 in) steel ball into wood to half the ball's diameter, in pounds force.

1. Lignum Vitae - 4500
2. Patagonian Rosewood - 3840
3. Brazilian Ebony - 3692
4. Brazilian Walnut - 3684
5. African Pearlwood - 3680
6. Bolivian Cherry - 3650
7. Lapacho - 3640

1. Gran Trak 10 - Atari (1974)
2. Night Racer - Micronetics (1977)
3. Turbo - Sega (1981)
4. Pole Position - Namco (1982)
5. Out Run - Sega (1986)
6. Hard Drivin' - Atari (1988)
7. Virtua Racing - Sega (1992)

1. Tokyo - 33,800,000
2. Mexico City - 22,900,000
3. Mumbai - 18,042,000
4. Sao Paulo - 17,711,000
5. New York City - 16,626,000
6. Shanghai - 14,173,000
7. Lagos - 13,488,000

1. Primate
2. Grand Theft Auto
3. Parapit
4. Black Hole
5. New South Wales
6. Lactose
7. O

1. Wasps
2. Ants
3. Bees
4. Termites
5. Aphids
6. Thrips
7. Naked Mole Rats