What's the Kennection? #291

According to the rules of major league baseball, bases may be canvas, but home plate must be made of what material?

In 1908, Port Arthur, Ontario became the first city in the world to enact a law "saving" what every summer?

What's the last name of actors Jeff and Beau, who first appeared together as children in the 1951 movie The Company She Keeps?

What units of energy used by nutritionists are actually 1,000 times as large as the units of the same name used by chemists?

Peter Garrett, an Australian cabinet minister from 2007 to 2013, also fronted what Diesel and Dust band in the 1980s?

What's the "Kennection"?