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...de-excited by collision with another particle before a photon can be emitted spontaneously. Such low densities cannot be achieved on Earth which is why these lines are not observed in the laboratory. When they are observed astronomically, we can be sure that they have been produced in a region of extremely low density. They are prominent in the spectra of active galaxies...

...Table 1 Podcasts Podcast title Links Description (from the website) Banking Information Security Podcast Direct iTunes Audio interviews with banking/security leading practitioners and thinkers. BTR: Security with Caleb Barlow | Blog Talk Radio Direct iTunes Caleb Barlow, Director of Application, Data and Mobile Security at IBM presents a podcast on the changing landscape...

...Table 1 Motivating factors for participating in citizen science Motivating factor: Yes / No Rank (based on your choices) Spending time outdoors Helping at a specific place, site or area Contributing to scientific knowledge Helping wildlife Sharing my knowledge / expertise Learning new things Meeting people / for fun Getting exercise Developing new skills Furthering my...