What is a rip current and what happens if you get caught in one while swimming at the beach? - Quora
Know the warning signs of deadly rip currents
Here's How to Spot Rip Currents
How to spot a rip: Take the test to see if you know how to spot a rip at the beach with tips from Life Saving Victoria
What are rip currents and how to spot them from the shore?, Florida Swim School posted on the topic
How to Spot a Rip Current and Tips to Help You Get Out of One
How to spot a rip current and what to do if you're trapped in one
How to Spot a Rip (and what to do if you're in one) – Surf Nation
Beach safety: How to spot a rip and avoid dangerous surf, jellyfish and sharks - ABC News