Crash Course Chemistry Consultant, Dr. Heiko Langner talks to Hank about lab safety, geochemical research, and cleaning up super fund sites. Afterward, Jessi Knudsen from Animal Wonders joins them with Zapper, the Alexandrian Parakeet....

Banska Stiavnica, one of Slovakia's most beautiful cities, boasts a medieval center and historic silver mines that are UNESCO World Cultural Heritage sites. Its highlights include the Kammer-Hof, home to the world's first technical...