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A) Interesting science articles from www.newscientist.com

  1. 2021mar5 Space - Photonic laser thruster could power spacecraft from Earth A new laser thruster could be a step towards new technology to push satellites rapidly between planets.
  2. 2021mar5 Life - From the Wild Sea review: Inside the fight to save the ocean's mammals It had been transported from a rescue centre where seals are taken when they are poisoned or harmed by oil or other industrial waste in the ocean – or when they hit rocks dodging storms
  3. 2021mar3 Humans - The hidden rules that determine which friendships matter to us Evolutionary psychologist Robin Dunbar has found that our friendships are governed by secret rules, based on everything from your sex to your sleep schedule. Our unique social fingerprints help determine who we are drawn to, which friendships last and why some friends are ultimately replaceable
  4. 2021feb24 Life - How to spend a trillion dollars to fix climate change and end poverty Let's imagine you have inherited a fortune and want to solve the world's most pressing problems. Here's the best way to spend your money to make a difference to climate change, disease and poverty

B) Interesting science articles from www.scientificamerican.com

  1. 2021jan29 Conservation Opinion - The Real Cost of Planting Trees Careful monitoring and up-front investment are necessary to ensure reforestation efforts yield benefits for communities and biodiversity
  2. 2020dec9 Computing - Artificial Intelligence Is Now Shockingly Good at Sounding Human
  3. 2020nov23 Biology - Bumblebees' Self-Image Gets Them through Tight Spots If necessary the bees will even turn themselves sideways to get through a hole.

C) Interesting engineering articles from www.createdigital.org.au

  1. 2021jan13 Innovation - Engineers create drones made of pineapple leaves Malaysian engineers have transformed the fibre found in pineapple leaves to make a sturdy, biodegradable material to build frames for unmanned aircraft.
  2. 2019nov1 Transport - The scramjet is a super-fast, experimental engine with no moving parts A) "A scramjet engine is a type of ramjet in which injected fuel is burned in a supersonic airstream within the engine,"" explained Bowcutt. "For ramjets, fuel combustion occurs in subsonic air, which is what makes it different from a scramjet." Ramjets and scramjets, he said, are both air-breathing jet engines that do not employ compressor blades to compress the air. Ramjets operate up to about Mach 5. B) "Beyond Mach 5, air pressure and temperature become too high in the engine for it to operate at optimal levels," Bowcutt said. "To prevent this condition, the air is allowed to remain at supersonic speed in the engine, which by definition makes it a scramjet." "Speed therefore dictates the type of engine used for air-breathing flight: turbofan/turbojet to about Mach 3, ramjet to about Mach 5, and scramjet beyond." C) "It employs what is called a turbo-ramjet engine, which is the integration of turbofan and ramjet engines into a combined propulsion system," he explained.
  3. 2020mar5 Trends - 10 global challenges the world will face in the next 25 years - according to engineers The top 10 global challenges identified by respondents are: Securing cyberspace, Economical clean energy, Sustaining land and oceans, Sustainable and resilient infrastructure, Sustainable cities, Access to clean water and sanitation, Clean air, Food security Preparing for and containing pandemics, Developing and delivering better medicines

D) Interesting engineering articles from spectrum.ieee.org

  1. 2021jan28 Robotics, Drones - Smellicopter Drone Uses Live Moth Antenna to Track Scents Robots are no match for the sensors insect are born with, but that doesn't matter if we can just steal them. To make one of these sensors, you just, uh, “harvest” an antenna from a live hawkmoth. Obligingly, the moth antenna is hollow, meaning that you can stick electrodes up it. Whenever the olfactory neurons in the antenna (which is still technically alive even though it's not attached to the moth anymore) encounter an odor that they're looking for, they produce an electrical signal that the electrodes pick up. Plug the other ends of the electrodes into a voltage amplifier and filter, run it through an analog to digital converter, and you've got a chemical sensor that weighs just 1.5 gram and consumes only 2.7 mW of power. It's significantly more sensitive than a conventional metal-oxide odor sensor, in a much smaller and more efficient form factor, making it ideal for drones. There are a few other constraints to keep in mind with this sensor as well. First, rather than detecting something useful (like explosives), it's going to detect the smells of pretty flowers, because moths like pretty flowers. Second, the antenna will literally go dead on you within a couple hours, since it only functions while its tissues are alive and metaphorically kicking.
  2. 2021jan29 Robotics - Meet Blueswarm, a Smart School of Robotic Fish The robofish, called Bluebots, autonomously synchronize their swimming. It is a self-organizing system.

E) Interesting engineering articles from www.popularmechanics.com

  1. 2021jan25 Jeff Bezos Is Backing an Ancient Kind of Nuclear Fusion. This tech could be more practical than tokamaks. Like a tokamak, an MTF reactor involves hot plasma contained by a powerful magnetic field. But where a tokamak is heated by extraordinary outside power, the MTF reactor made by Canada's Jeff Bezos-backed General Fusion is pressurized to superheat the plasma—like a party filled with dancing people where the room continues to shrink around them. This pressure is applied by pistons that coordinate to make a pressure wave.
  2. 2020sep2 The Best Battery-Powered Leaf Blowers This new generation of electric blowers can whoosh away just about anything.
  3. 2020apr6 This Guy Says He Solved the Most Controversial Open Problem in Math. He has the (600-page) proof. But other mathematicians have their pitchforks. The abc conjecture expresses a profound link between the addition and multiplication of integer numbers. Any integer can be factored into prime numbers, its ‘divisors': for example, 60 = 5 x 3 x 2 x 2. The conjecture roughly states that if a lot of small primes divide two numbers a and b, then only a few, large ones divide their sum, c.
  4. 2021jan29 Humans Can Theoretically Harness Energy From Black Holes "Black holes are commonly surrounded by a hot 'soup' of plasma particles that carry a magnetic field," lead author Luca Comisso, a physicist at Columbia University, said in a statement. "Our theory shows that when magnetic field lines disconnect and reconnect, in just the right way, they can accelerate plasma particles to negative energies and large amounts of black hole energy can be extracted."

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