Credit:
http://doodlegod.wikia.com/wiki/Greatest_InventionsTo pass "Greatest Inventions" you will need to do:
COMPONENTS
Fire + Energy = Plasma
Plasma + Void = Sun
Electricity + Knowledge = Semiconductor
Energy + Semiconductor = Radio Wave + laser
Cart + Oil = Car
Air + Earth = Dust
Human + Money = Shopping
Fabric + Human = Clothing
Energy + Grass = Tea
Knowledge + Paper = Book
Air + Car = Airplane
Clothing + Metal = Armor
Glass + Void = Lightbulb
Mechanism + Time = Clock
Airplane + Void = Rocket
Rocket + Weapon = Missile
Knowledge + Life = DNA
Lightbulb + Semiconductor = Vacuum Tube
Electricity + Void = Radiowave
INVENTIONS BY DECADE
Year 1900
Air + Freezer = Air Conditioner
Fabric + Tea = Teabag
Order + Work = Assembly Line
Knowledge + Time = Theory of Relativity
Fabric + Oil = Cellophane
Dust + Void = Vacuum Cleaner
Limestone + Oil = Crayons
Clothing + Water = Washing Machine
Air + Mechanism = Helicopter
Air + Fabric = Zeppelin
Year 1910
Clothing + Woman = Bra
Knowledge + Metal = Stainless Steel
Games + Knowledge = Crossword
Armor + Car = Tank
Air + Armor = Gas Mask
Electricity + Bread = Toaster
Knowledge + Human/Sin = Lie Detector
Food + Life = Vitamin
Electricity + Neon = Neon Lamp
Clothing + Mechanism = Zipper
Year 1920
Medicine + Bacteria = Antibiotics
Airplane + Radiowave = Radar
Fabric + Glue = Bandaid
Work + Mechanism = Robot
Knowledge + Void = Big Bang Theory
Glass + Sun = Sunglasses
Food + Fun = Bubble Gum
Car + Order = Traffic Lights
Food + Freezer = Frozen Food
Fun + Games = Yo-Yo
Year 1930
Cellophane + Glue = Duct Tape
Paper + Photo = Photocopier
Music + Radiowave = FM Radio
Mechanism/Time + Photo = Polaroid
Fire + Mechanism = Jet Engine
Radar + Void OR Knowledge + Radiowave = Radio Telescope
Games + Money = Monopoly
Shopping + Cart = Shopping Cart
Car + Money = Parking Meter
Knowledge + Magic = Software
Year 1940
Firearm + Magic = AK-47
Software + Transistor/Vacuum Tube = First Computer
Gas Mask + Water = Aqualung
Food + Radiowave = Microwave Oven
Money/Order + Shopping = Bar Code
Plutonium + Plutonium/Weapon = Nuclear Bomb
Missile + Weapon = Bazooka
Energy + Plutonium = Nuclear Power Reactor
Clothing + Sun = Bikini
Electricity + Semiconductor = Transistor
Year 1950
Airplane + Earth/Death = Black Box
Paper + Water = Liquid Paper
Money + Debt = Credit Card
Transistor + Transistor = Microchip
Clock + Transistor/Semi-Conductor/Neon lamp = Digital Clock
Robot/Rocket + Void = Satellite
Food + Time = Fast Food
Electricity + Sun = Solar Cell
Fire + Radio Wave = Laser
Glue + Time/Glue/magic = Super Glue
Year 1960
Life/Laser + Photo = 3d Holography
First Computer + Photo = Digital Photography
Credit Card/Mechanism + Money = ATM
Book + Software = Hypertext
Human + Void/Rocket = Astronaut
Armor + Fabric = Kevlar
Cellophane + Music = Audio Cassette
Car + Void = Moon Lander
First Computer + Games = Video Game
First Computer + Video Game = Computer Mouse
Year 1970
Phone + Radiowave = Cellphone
Games/Video Game + Music = Karaoke
Games + Puzzle = Copyright
Microchip + Software = Microprocessor
Digital Photography + Time/Life = Digital Camera
First Computer + Micro-processor = Personal Computer
Audio Cassette/Cellophane + Software = Floppy Disk
Astronaut/Satellite + Satellite = Space Station
Car + Electricity = Hybrid Vehicle
Music/Audio cassette + Music = Stereo
Year 1980
Mechanism + Medicine/Life = Artificial Heart
First Computer + First Computer = Internet
Floppy Disk + Laser = CD
Personal Computer + Software = MS-DOS
DNA + Knowledge = DNA Fingerprinting
Space Station/Satellite + Space Station = Modular Space Station
Paper + Phone = Fax Machine
Life + Video Game = Virtual Reality
Book + Microchip = Flash Memory
MS-DOS + Software = Windows
Year 1990
CD + CD = DVD
Rocket + Water = Sea Launch
Radiowave/Knoweldge/Digital Clock + Satellite = GPS
Cellphone + Personal Computer = Smartphone
Microchip + Music = MP3 Player
Order + Personal Computer = USB
Flash Memory + Book/Software = Memory Card
Hypertext + Internet = WWW
Plasma + TV = Plasma TV
Digital Camera + Internet = Webcam