4 - 1The Science Behind Electronics Recycling Jul. 24, 2021- 4 - 2The Power of Air Jul. 31, 2021
- 4 - 3Innovations in Forestry Management Aug. 07, 2021
- 4 - 4Empty Driver's Seat Aug. 14, 2021
- 4 - 5Semiconductors in Space Aug. 21, 2021
- 4 - 6Science Behind Relocation Aug. 28, 2021
- 4 - 7Pipe Dreams Sep. 25, 2021
- 4 - 8The Clean Factor Oct. 23, 2021
- 4 - 9The Past, Present, and Future of Nuclear Energy Oct. 30, 2021
- 4 - 10Big Power in Small Packages Nov. 06, 2021
- 4 - 11Nuclear Does What, Now? Nov. 13, 2021
- 4 - 12Getting Paid to Shop Nov. 20, 2021
- 4 - 13The Science Behind Supplements Nov. 27, 2021
- 4 - 14The Tires of Tomorrow Dec. 11, 2021
- 4 - 15Material Science Meets Building Science Dec. 18, 2021
- 4 - 16Cyber Security: Thinking Like an Attacker Jan. 29, 2022