Learn about how quitting smoking may reawaken healthy cells; how researchers figured out how to tell the age of crime scene fingerprints to help investigators; and why you sometimes yawn while exercising or singing.

Quitting smoking doesn’t just slow lung damage, but can also reawaken undamaged cells by Grant Currin

• Gallagher, J. (2020, January 29). Lungs “magically” heal damage from smoking. BBC News. https://www.bbc.com/news/health-51279355
• Pfeifer, G. P. (2020, January 29). Smoke signals in the DNA of normal lung cells. Nature, 578(7794), 224–226. https://doi.org/10.1038/d41586-020-00165-7
• Yoshida, K., Gowers, K. H. C., Lee-Six, H., Chandrasekharan, D. P., Coorens, T., Maughan, E. F., Beal, K., Menzies, A., Millar, F. R., Anderson, E., Clarke, S. E., Pennycuick, A., Thakrar, R. M., Butler, C. R., Kakiuchi, N., Hirano, T., Hynds, R. E., Stratton, M. R., Martincorena, I., … Campbell, P. J. (2020, January 29). Tobacco smoking and somatic mutations in human bronchial epithelium. Nature, 578(7794), 266–272. https://doi.org/10.1038/s41586-020-1961-1

It's been impossible to tell the age of crime scene fingerprints — until now by Grant Currin

• Determining Fingerprint Age with Mass Spectrometry Imaging via Ozonolysis of Triacylglycerols. (2020, January 3). Analytical Chemistry. https://pubs.acs.org/doi/abs/10.1021/acs.analchem.9b04765
• Residues in fingerprints hold clues to their age. (2020, January 22). EurekAlert! rif012220.php">https://www.eurekalert.org/pub_releases/2020-01/acs-rif012220.php

Why we yawn during exercise by Ashley Hamer (Listener question from Kate in Pennsylvania)

• Provine, R. R., Tate, B. C., & Geldmacher, L. L. (1987). Yawning: No effect of 3–5% CO2, 100% O2, and exercise. Behavioral and Neural Biology, 48(3), 382–393. https://doi.org/10.1016/s0163-1047(87)90944-7
• Massen, J. J. M., Dusch, K., Eldakar, O. T., & Gallup, A. C. (2014). A thermal window for yawning in humans: Yawning as a brain cooling mechanism. Physiology & Behavior, 130, 145–148. https://doi.org/10.1016/j.physbeh.2014.03.032
• The science of the exercise yawn. (2017). Furthermore from Equinox. https://furthermore.equinox.com/articles/2017/09/yawning
• McKinney, James C. The Diagnosis and Correction of Vocal Faults. (2005). Google Books. https://books.google.com/books?hl=en&lr=&id=znaCDwAAQBAJ&oi=fnd&pg=PA1&dq=singing+yawn&ots=DKpXxdwhGJ&sig=IjgkdxkqyENjWLoXJTDaYB94G30#v=onepage&q=yawn&f=false

Subscribe to Curiosity Daily to learn something new every day with Cody Gough and Ashley Hamer. You can also listen to our podcast as part of your Alexa Flash Briefing; Amazon smart speakers users, click/tap “enable” here: https://curiosity.im/podcast-flash-briefing

Find episode transcript here: daily-4e53644e.simplecast.com/episodes/when-smokers-quit-dormant-lung-cells-wake-up">https://curiosity-daily-4e53644e.simplecast.com/episodes/when-smokers-quit-dormant-lung-cells-wake-up