Who invented the modern air conditioner?

Willis Carrier

Where did Paul preach about the 'unknown god'? What's the title of the first movie in the "Austin Powers" comedy series? What reptile can famously change its skin color according to mood, temperature, and environmental factors? Which dairy-based beverage is fermented with probiotic bacteria and has origins in the Caucasus region? Who did David become best friends with, even though his friend's father wanted to harm David?