"What's interesting about these organisms is that they are very sensitive to environmental changes" -Jahnavi Punekar

This LPI is about mass extinctions. Big die-offs like the one Humanity is currently causing. It focuses on dating and analyzing using foraminifera, or forams for short. These like diatoms, leave hard shells when they die, but they are single celled. That means they evolve rapidly, and the shells are diverse. It's easy, real easy, to chronologically date ocean sediments this way. Takes a lot of the guesswork out, no need for radiometric dating. 

Of course, forams are very sensitive to environmental changes, so guess what's happening to them right now?

• At 17:40 she actually shows you the specific foraminifera that were-then-gone at the KT extinction. 
• At 20:20, the term "disaster opportunist" gets used. And the implications are interesting. 
• 24:50 Mesotrophy opportunist blooms. Have you heard of dead-zones in relation to river outlets? 
• At 42:00 the conclusions. One theme in here is a greater emphasis on the Deccan Traps being involved alongside the Chicxulub impact at the KT boundary. She demonstrates the case well. 

In general I want to credit this speaker for her use of assets. Her slideshow skills are a notch above average. In other words this is a very colorful and intuitive LPI. You don't have to be an ultra-nerd to follow.