I am coming in late on this one, but I thought I would comment anyway....

The Computer: Greek

Penicillin: Technically correct, but first known to be of any use by a scotsman.

Jet Engine: Germany was working on it at the same time, and completed the first Jet Engine 2 years earlier (1939)

Microphone : Emile Berliner on Germany wad the first to invent a Microphone.

Steam Engine: Greek scientist Heron of Alexandria

Electric Transformer: Austria (Nikola Tesla)

Flushing toilet have been around as early as 26th century BC

Calculus: Co-founded with Germany.

Telephone: Scottsman

Radio: Nikola Tesla

Insulin: Scottish / Canadian.

Beta-blockers: Scotland.

So yea, you do get to technically clam the Scottish as your own, so you do get to call there inventions yours, but to say you invented all those things is a little far fetched.

US history is cool.

In soviet Russia history studies you

Erm, I hate to break this one to you but Scotland is in Britain, it's that big big in the north. Also radio was invented by Marconi, he was the first to transmit anything and do any work of importance. And the co-founded things... still invented in Britain, just because work was done in other countries too.

Besides the steam engine in the context we use it the catalyst for the industrial revolution. People played with little models in greek times yes, but no-one ever hauled a few hundred tonnes of coal round a country with it.

Oh and the copmputer... yuou kidding me. Charles Babage invented the computer, barely. I attribute the invention of the computer, or as we know computers to Alan Turing. To say otherwise is foolish.

What changed about the computer and steam engine to make the ancient ones not count? Too small? Does that make them somehow not computers or steam engines? Maybe the British gave those ancient thousand-year-old boring inventions major advancements that led to major breakthroughs, and maybe those breakthroughs involved new inventions of their own, but I wouldn't call those "inventing the computer and steam engine."

And I definitely give radio to Tesla. The whole world tries to steal his legacy; it's hilarious.

Antikythera mechanism was mechanical, it didn't work on anywhere near the same principle as computers we know and how Alan Turing defined.

Steam engine you could say it was them, but practical uses required inventions and innovations that came from Britain and other countries. It is a greek idea, or maybe older, but the innoivations that made the technology practical came from elsewhere.

To be honest I'm amazed Edison didn't theive the radio off Tesla, because Edison stole most the stuff he invented by the sounds of things. But I just looked up radio invention, it looks like Marconi did it in 1893 and Tesla in 1895, but boith have rights to claim it.

There is more than just history by country, what about the history of music or theater or art or computer science or math or religion or the video game industry? Everything has history and its always exciting in some way to see where you and the things around you have come from. Its epic drama, but its real epic drama. 

Also there is different degrees of each.  You could talk about the different generations of the Video Game Industry, or you could go into 3rd party companies and talk about how they developed and who came at what time and how.  You could talk about game design decisions and how they influenced the path of a company in relation to customer reception and even how success of those designs and character models related to its marketing, world events, or cultural changes.

Seriously there is so much information in history that is interesting its crazy.

Having said that, World history delves into the history behind many of the things mentioned above.  In that, I personally find it a bit more interesting.