We leave you this Sunday morning seeing green – new oak leaves sprouting in the woodlands near Petaluma, California. Videographer: Lee McEachern.

In Florida, correspondent Martha Teichner goes searching for sand dollars – cousins of sea urchins and sea stars – with naturalist Kristen Williams (a.k.a. The Seashell Mermaid). She also goes to the California Academy of Sciences' Steinhart Aquarium in San Francisco to learn what makes these sea creatures so special.

Founded in 1986, American Girl has created dolls, books and accessories that tell the stories of young girls in every American era. On the toy's 40th anniversary, correspondent Faith Salie explores how making history come alive is also creating timeless bonds between generations that celebrate girlhood.

To fuel their artificial intelligence initiatives, tech companies are building massive numbers of AI data centers, with more than 4,000 in operation across the country. But some communities, wary of the environmental and financial implications, are fighting back.

In this web exclusive, Sen. Dave McCormick (R-Pa.) talks with Robert Costa about how energy and the rise in artificial intelligence go hand-in-hand; America's rivalry with China over AI; and nuclear power.