Here are some one liners...
The Bering Strait and Seward's Folly -- As the Emperor is dying he signs the order sending Captain Bering on an expedition to map the eastern-most coastline of Russia. I talk about Alaska and how the USA bought it from the Russians.
Have the Stars Moved? OR HAVE I? -- An astronomer notices that the stars are not exactly where he expects them to be. Instruments are accurate enough to notice a slight difference. The reason? The Earth is moving.
A Spy is Born, as a Man... No, a Woman... Wait -- This dude looks like a lady and because of that the King is going to make him a spy. I talk about Caitlyn Jenner and the social pressure to conform.
The Bering Strait and Seward's FollyWith his dying hand, Emperor Peter the Great signs the order that sends Vitus Bering on his journey of exploration. It has been the Emperor's fondest wish to modernize Russia. He has been building up his navy and hiring the skills he needs from various seafaring nations such as Denmark. That explains how a Dane like Captain Bering was selected to head this expedition. It is known that Russia extends very far to the east, but they only have a vague notion of what is out that way. The Emperor is worried about European domination of those eastern regions so Captain Bering sets out on a secret mission to map the eastern coastline. The Emperor is already dead by the time the Captain finds the strait that will one day bear his name. Captain Bering is not the first European to reach the strait but he is the first to map it. Most global maps will split the world at the Bering Strait and place Alaska at the far left of the map.   
Have the Stars Moved? OR HAVE I?Something is wrong. The stars are not where they should be. As measuring instruments of the day have become more accurate, scientists are able to make more precise measurements. James Bradley has been trying to measure the distances to the stars using a method called parallax. In essence it is like triangulating on a radio signal. If you know the angle to your target signal (in this case, the light of a star) and then move to another location and measure the angle again, you have measured two angles of a triangle and can calculate the length of the sides. The math is not that tough but James has found an error. He knows what the angle should be to a given star. It should be there, but it is a little off. Since he hasn't moved his position, what changed? Did the star move or did he? He concludes that he moved... or that the Earth moved. He has found proof that the Earth is moving by measuring the aberration of light. It is like what happens when one is standing still in the rain. The drops come straight down, so one's umbrella is angled straight up but if one is running, the drops appear to fall at an angle so one changes the angle of the umbrella to compensate. By measuring the angle of compensation one can measure the speed. This. Is. Freakishly. Clever.  
A Spy is Born, as a Man... No, a Woman... WaitCharles is born to a poor noble family in north-central France. His father is an attorney who will eventually become mayor of their township. Growing up, Charles will not look like a man, strictly speaking. It is difficult to tell. He will exploit his ambiguous and androgynous look to become a spy working on behalf of King Louis the 15th, but it will be more like Mission Impossible... "... should you be caught or killed..." no one is going to admit they ever knew you. Charles will be sent to Russia to infiltrate the court of Empress Elizabeth. At that time French men will not be allowed into Russia, but women and children will be able to cross the border. He/She will present herself convincingly as Lady Lea de Beaumont and he/she will become maid of honor to the Empress. When he returns to France, he will be knighted for more things than simply impersonating a lady, but if they had movies back then, he would be selling the rights to his story for millions. 
This Year in Wikipedia
Year 1728, Wikipedia.