| There are a lot of articles about how lead poisoning (especially from fumes of motorcicle exhausts) affected US citizens. what about the rest of the world? Posted: 30 Jun 2022 02:50 PM PDT i know for a fact that fuel enriched with lead was also used outside of the USA. yet, i realy can't find anything about it. my last post was completely ignored. i'd appreciate any info submitted by /u/se_nicknehm [link] [comments] |
| AskScience AMA Series: We're NASA asteroid experts! ¡Somos expertos en asteroides de la NASA! Ask us anything (in English and Spanish/en inglés y en español) about near-Earth objects and how we're working to protect Earth from potentially hazardous asteroids! Posted: 30 Jun 2022 04:00 AM PDT ¡Somos expertos en asteroides de la NASA! ¡Pregúntanos cualquier cosa (en inglés y en español) sobre objetos cercanos a la Tierra y cómo trabajamos para protegerla de asteroides potencialmente peligrosos!
Today, June 30, is International Asteroid Day-but at NASA, every day is asteroid day! Asteroids are rocky, airless remnants left over from the early formation of our solar system about 4.6 billion years ago and NASA and our partners are always looking to the skies to study these ancient time capsules. From our missions to explore the Trojan asteroids in Jupiter's orbit and bring a piece of an asteroid back to Earth, to our efforts to find, track and monitor asteroids and other near-Earth objects to protect our planet from potential impact hazards, we're uncovering the history of our solar system while working to keep our future safe. Ask our experts anything about what we're learning from asteroids, how we're protecting the Earth, and much more! Talent: - Lindley Johnson, NASA Planetary Defense Officer, NASA Headquarters
- L.A. Lewis, FEMA Detailee, NASA Planetary Defense Program Officer, NASA Headquarters
- Dr. Shantanu Naidu, Navigation Engineer, NASA Center for Near-Earth Object Studies (CNEOS)
- Dr. Joe Masiero, NEOWISE Deputy Principal Investigator & NEO Surveyor team member, Caltech
- Dr. Carolyn Ernst, DRACO Instrument Scientist, JHU APL
- Prof. Vishnu Reddy, Associate Professor, University of Arizona
- Dr. Lucas Paganini, Program Scientist, NASA Headquarters - Spanish-Speaking Expert
Hoy, 30 de junio, es el Día internacional del asteroide, pero en la NASA, ¡todos los días son días de asteroides! Los asteroides son restos rocosos sin atmósfera que quedaron de la formación temprana de nuestro sistema solar hace unos 4.600 millones de años. La NASA y sus socios miran constantemente al cielo para estudiar estas antiguas cápsulas del tiempo. Desde nuestras misiones para explorar los asteroides troyanos en la órbita de Júpiter y traer un trozo de asteroide de vuelta a la Tierra, hasta nuestros esfuerzos para encontrar, rastrear y monitorear asteroides y otros objetos cercanos a la Tierra para proteger nuestro planeta de posibles peligros de impacto, estamos descubriendo la historia de nuestro sistema solar mientras trabajamos para mantener nuestro futuro seguro. Pregunta a nuestros expertos cualquier cosa que quieras saber sobre lo que estamos aprendiendo de los asteroides, cómo estamos protegiendo a la Tierra y mucho más. Talento: - Lindley Johnson, Oficial de Defensa Planetaria de la NASA, Sede de la NASA
- L.A. Lewis, Oficial del Programa de Defensa Planetaria de la NASA, Sede de la NASA
- Dr. Shantanu Naidu, Ingeniero de navegación, Centro de estudios de objetos cercanos a la Tierra de la NASA (CNEOS)
- Dr. Joe Masiero, Investigador principal adjunto de NEOWISE y miembro el equipo del telescopio NEO Surveyor, Instituto de Ciencia Planetaria
- Dra. Carolyn Ernst, científica del instrumento DRACO, JHU APL
- Prof. Vishnu Reddy, Profesor Asociado, Universidad de Arizona
- Dr. Lucas Paganini, Program Scientist, NASA Headquarters - Experto hispanohablante
Our guests will be joining us at 12:00 - 1:30 p.m. EDT. Please forgive the moderator over formatting difficulties. Nuestros invitados llegan a las 12:00 a 1:30 p.m. (UTC-4). Por favor, perdone al moderador por las dificultades de formato. Username/Usuario: /u/nasa
EDIT: That's a wrap for this AMA – thanks to everyone for your great questions! You can learn more about asteroids on NASA's Asteroid Watch and Planetary Defense Coordination Office websites – and follow us on Twitter at AsteroidWatch and NASASolarSystem. submitted by /u/AskScienceModerator [link] [comments] |
| Does all life on earth originate from the same source? In other words, do humans and cabbages share a common ancestor? Posted: 30 Jun 2022 11:31 AM PDT |
| How far could a modern human go back though evolution and still be able to reproduce successfully with said ‘earlier humans’? Posted: 30 Jun 2022 10:58 AM PDT |
| Why do we have baby teeth and adult teeth? Posted: 30 Jun 2022 02:40 PM PDT What's the difference in composition between the two sets? Is there a reason why we can't develop adult teeth in replace of baby teeth and only live with the one set? I imagined that perhaps as your increased calcium intake had something to do with it. Are there any conditions that can affect this transition, is it even necessary? TIA submitted by /u/r_f4h4d_ [link] [comments] |
| Does the brain go through any physiological changes when the person is in coma? And are there any differences between medically induced coma? Posted: 29 Jun 2022 07:02 PM PDT |
| Any proof that getting waxed actually ‘lessens hair growth’—or effect it at all? Posted: 29 Jun 2022 06:39 PM PDT |
| If you have the genes for lactase persistence, such as is common in European populations, but stop consuming lactose for a period of time, is it possible to lose the ability to metabolize lactose, does lactase production stop without constant intake? Posted: 30 Jun 2022 04:42 AM PDT This question seems to come up often, but is riddled with anecdotes that don't make things clear. I've seen people talk about stopping diary then becoming intolerant after doing that for a number of months - but were they always intolerant (had no lactase enzymes) and just never knew it? I'm aware that apparently, with enough consumption, even people with no lactase production can metabolise lactose (in limited quantities) as gut bacteria can take over - is this what happens in the above examples where people 'lose' their ability to metabolise it? They just didn't know they had no lactase, and it was gut flora doing the work? I ask because I've been recently suffering with infrequent IBS and I am trying an elimination diet of things that may trigger it for a period of a few months, then slowly reintroduce it and hope that things clear up. However, the possibility that my ability to metabolise lactose might disappear because of that does make me concerned. As far as I'm aware, I have the genes for full lactase persistence. They don't just get shut off if you stop consuming diary for a while, do they? submitted by /u/Tephnos [link] [comments] |
| Does pressure affect the way atoms bond? Are there any compounds/reactions that are not possible at NTP but could be if the reactants are placed in a chamber with a higher/lower pressure? Posted: 30 Jun 2022 10:54 PM PDT |
| Does the chemical balance of the brain cause depression or is it an expression of it? Posted: 30 Jun 2022 01:45 PM PDT How would we know the difference? It seems a very important point to understand how to prevent and treat depression. The extend to which depression is being talked about almost as a purely physical ailment like a broken leg or a weak heart in modern culture has helped destigmatize it but it just makes me wonder if this is really the right way to think about it. Thinking about it as a syndrome seems to put the problem on the shoulders of the individual rather than their enviroment (and vice versa). Any input would be appreciated. Maybe some neurobiological insight? Edit: arguably this is a psychology or even philosophy question but I'm specifically interested to know if any neurobiological research has been done on this. submitted by /u/Tokentaclops [link] [comments] |
| How can bones last so long outside the body (such as a skeleton after the person/animal dies) yet become brittle and weak with age during a shorter period in the body (e.g. dogs in 15 years)? Posted: 29 Jun 2022 06:25 PM PDT |
| When we take “pictures” of atoms, what are we actually seeing? Posted: 30 Jun 2022 09:25 AM PDT |
| Is it possible that life on earth originated from extraterrestrial origins? Such as Eukaryotic/Prokaryotic cells attached to a meteor that hit earth? Posted: 01 Jul 2022 12:49 AM PDT |
| Is it really true that permafrost actually holds some ancient microorganism and how dangerous it is in our era today ? Posted: 30 Jun 2022 09:41 AM PDT |
| How sustainable and efficient are hydrogen fuel and hydrogen fuel systems, and what is the resulting byproduct from its production? Posted: 30 Jun 2022 10:53 AM PDT |
| How do urine drug tests work? In particular, how come the presence of two bands (test + control) means there is NO drug present Posted: 29 Jun 2022 02:13 PM PDT Urine drug tests that rely on dipsticks seem really counterintuitive. There, the presence of two bands (test + control), no matter how faint, means that the sample is negative for the drug tested. On the other hand, the absence of a band in the test area means the sample is positive. This is of course the 'opposite' of how COVID-antigen tests work. Moreover, if the test is detecting the drug (or a secondary metabolite) through immunocolorimetry, the way these tests work make little sense. Could anybody explain? It'd be greatly appreciated. submitted by /u/britainpls [link] [comments] |
| Does a having a high school pep rally before a football game increase the odds of winning the game in any measurable way? Posted: 29 Jun 2022 06:43 PM PDT |
| Does opening medicine container (pills) affect expire date? Posted: 30 Jun 2022 10:51 AM PDT Once a container with pills is opened (only opened once, than closed after about a minute), does that have any effect on the expiry date of the drug? Or does it remain the same regardless of whether the container has/hasn't been opened at all submitted by /u/djm2467 [link] [comments] |
| Did we know about dinosaurs before fossils? Posted: 29 Jun 2022 04:54 PM PDT |
| Do the least advanced animals, speaking in terms of intelligence, have or employ a primitive way of counting? Posted: 29 Jun 2022 07:41 PM PDT For example, does one fish in a school of fish -- no pun intended -- have a concept of numbers by seeing how populated by other fishes his immediate surroundings are and "feeling lonely" or "in danger" if there are not as many fishes? submitted by /u/param_T_extends_THOT [link] [comments] |
| Does the abundance of heavy metals in coal imply that they used to be more abundant in the biosphere? Posted: 30 Jun 2022 08:02 AM PDT One of the (many) environmental considerations of burning coal is the release of heavy metals, specifically lead and mercury. Since coal is the compressed remains of (mostly plant) organisms in the distant past, does that mean that such metals used to be much more abundant in the tissue of life on earth? If not, is the process of how they got there understood? If so, does that imply that life on earth used to be more adapted to elevated levels of heavy metals? submitted by /u/SpikeMF [link] [comments] |
| Do all animals from the camel family have a long Loop of Henle? Posted: 30 Jun 2022 10:30 AM PDT |
