Image credits: Top Left - HidrateSpark PRO Water Bottle (Hidratespark.com), Top Middle - Samsung Family Hub™ 4-Door Flex™ Refrigerator (Samsung.com), Top Right - Apple Watch with Activity Rings (De...

Knock knock. Who’s there? If you had a smart video doorbell, you’d already know. Even if you were out of town. About 16% of Americans have video doorbells, and the number is growing. What is a smar...