1. sand dosent fall if redstone is on the block beneath
2. there are 6 Biomes; tundra, desert, swamp, forest, plain, mycelium
3. pumpkins and melons dont grow fully when given bonemeal
4.there are the following mobs
real world nether end
--------------- ------------- ---------
cow, chiken, squid, sheep, ghast, pigman, dragon, wolf, pig, zombie, skeleton, blaze, magmacube endermen
spider, cave spider, creeper,
endermen, slime

so altogether without doubling up there are 18 mobs (good and bad)
5.crops dont need water to grow
6.natural sand/gravel dosent fall if u dont disturb it
7.if you put blocks onthe side of a sapling then pump it with bonemeal it grows even bigger :)
8. redstone powers nine blocks either side of the power source
9.pistons brake pumpkins and melons when they extend
10.NPC villages are mostly/always found in the desert :/