Human and Horse
Austin and Boston
Copper and Tin
Wilbur and Orville
The Pyramids of Giza and the Leaning Tower of Pisa
Gondwana and Laurasia
Mercury and Venus, scientists believe due to Mercury and Venus proximity to the sun, any possible moons could have been sucked up by the Sun’s gravity.
Spirit and Opportunity
Red and Green
Georgia and Jordan
Silver and Copper
Integrated Electronics
Q and Z
Port and Starboard
Mercury and Bromine
Kazakhstan and Lichtenstein
USA and Canada
Gold and Copper
African and Asian
Budapest (Hungary) and Bucharest (Romania)