Yeah, Tesla is also my favorite scientist, (not only because i like frying hoards of Allied tanks with Tesla coils.)
Tesla had many inventions but I'd like to start with the more bizzare ones.
Tesla developed an automated computer system that could be remote-controlled from a great distance. He demonstrated wireless ships and subs at and exposition in Madison Square Garden in 1898. The automated apparatus was so advanced that it recognized voice commands from Tesla or volunteers.
In public, Tesla spoke only of the humanitarian virtues of the invention: it would lessen the toils and drudgery of mankind and keep human lives out of harm's way. But Tesla actually had his hopes on a contract with the U.S. military. In a presentation before the War Department, Tesla argued that his unmanned torpedo craft could obliterate the Spanish Armada and end the war with Spain in an afternoon. The government never took Tesla up on his offer.
Tesla was nearly broke and saw America on the verge of war, so he embarked on a project of great magnitude: the Death Ray!
The Death Ray was apparently some sort of particle accelorator. Tesla said it was an outgrowth of his magnifying transformer, which focused its energy output into a thin beam so concentrated it would not scatter, even over huge distances.
It wasn't confirmed if he ever used the Ray, or if he even built it, but the following supposedly happened one dark and stormy(nevermind) night in 1908:
At the time Robert Peary was attempting his second trip to the North Pole, Tesla had told the expedition that he would signal them somehow. They were to report to him any strange occurences on the open tundra. On June 30th Tesla aimed the Ray across the Atlantic towards the Arctic to a location he calculated was west of Peary's location. He switched it on and its extremity started to emit a barely visible glow. An owl flew from it perch and passed through the beam, it disintegrated instantly. This concluded the test and Tesla waited for any further reports and sent telegrams to Peary to confirm the Ray's effectiveness, nothing turned up. Tesla was about to give up when news come of a strange event in Siberia.
On June 30th a massive explosion equivalent to ten to fifteen megatons of TNT had devastated Tunguska, 500 thousand squares acres destroyed and trees litteraly
flattened. It was the largest explosion in human history, surpassing even those of subsequent nuclear detonations. The explosion was heard 620 miles away. It is generally believed that it as caused by a meteorite or a comet fragment, though no obvious mineral remnants or impact site was discovered.
Mr. Nikola had a different explanation. It was obvious that the Ray had overshot its intended target and destroyed Tunguska. He was thankful beyond measure that the explosion had --miraculously--killed no one. Tesla dismantled the death ray at once, deeming it too dangerous to remain in existence.
Tesla made one one further attempt to aid in his country's war effort. In 1917, he conceived of a sending station that would emit exploratory waves of energy, enabling its operators to determine the precise location of distant enemy craft. The War Department rejected Tesla's "exploring ray" as a laughing stock.
A generation later, a new invention exactly like this helped the Allies win World War II. It was called radar.
He also theorized that he could use the planets magentic field to create free energy. There is a conspiracy theory that the oil companies assasinated him because of this and stole most of his plans.
Tesla's more "mundane" inventions:
Tesla Coil
Alternating Current (AC)
Radio
AC Induction Motor
Tesla Oscillator
Wireless Power Transmission
Flourescent Lights
Hydroelectric Generators
Microwaves
Vacuum Tubes
X-Rays