Artificial light at night (ALAN) causes a wide range of ecological impacts across diverse ecosystems. ALAN poses a particular risk to associated wildlife by disrupting physiology, behaviour and ultimately survival. Globally, streetlights are currently being retrofitted with newer technologies that differ in the spectrum & intensity of their emissions. There is a dearth of in situ urban experiments on the ecological impacts...
US aircraft manufacturing giant Boeing has revealed a new ultraviolet wand it says could help disinfect aircraft to protect passengers from viruses. As the aviation industry grapples with the fallout from the coronavirus pandemic, airlines and manufacturers are scrambling to restore confidence among passengers concerned about the safety of air travel during Covid-19. Boeing claims its prototype UV light can "clean to a high degree – to a disinfecting level – certain pathogens".
Alternative conceptions about light and shadows — PLD. Children naturally and instinctively develop their own ideas about how things work. These self-developed concepts make sense to the individual but may be scientifically inaccurate. It is helpful to know some of the common alternative conceptions students may hold. Awareness helps educators identify them when they surface in discussions and provides an opportunity to scaffold change.
Light – colour and fluorescence — TEACHING RESOURCE. Visible light is the small part within the electromagnetic spectrum that human eyes are sensitive to and can detect. Visible light waves consist of different wavelengths. The colour of visible light depends on its wavelength. These wavelengths range from 700 nm at the red end of the spectrum to 400 nm at the violet end.
Investigating shadows using transparent, translucent and opaque materials — PLD RESOURCE In this set of investigations, students explore objects made from materials that are transparent, translucent and opaque and the effect this has on their shadows. The investigations are designed for students working at New Zealand Curriculum levels 1 and 2.
Light – polarisation — TEACHING RESOURCE Polarised sunglasses look like regular sunglasses, but they are able to filter out the glare from automobile windscreens and the surface of water. The glasses you wear when watching a three-dimensional (3D) film work because the lens of each eye is polarised in different directions.
The International Astronomical Union (IAU) is concerned about these satellite constellations. The organisation, in general, embraces the principle of a dark and radio-quiet sky as not only essential to advancing our understanding of the Universe of which we are a part, but also as a resource for all humanity and for the protection of nocturnal wildlife. We do not yet understand the impact of thousands of these visible satellites scattered across the night sky and despite their good intentions...
In this activity, students use scientific models and exploration to observe the position of the Sun and its physical effect on light and shadows. The activities are designed for students working at New Zealand Curriculum levels 1 and 2. The activities cover both Physical World and Planet Earth and Beyond concepts.
Simply speaking, a shadow is an absence of light. If light cannot get through an object, the surface on the other side of that object (for example, the ground or a wall) will have less light reaching it. A shadow is not a reflection, even though it is often the same shape as the object.
In this set of activities, students are introduced to basic Physical World concepts about light through the use of play and exploration. Students also have the opportunity to design simple investigations and learn how science works as an introduction to the nature of science.
In this activity, students use a sheet of acetate to make a transparent, four-sided pyramid. The pyramid’s sides act as four mirrors, situated at 45° angles on a smartphone or tablet screen, and create a hologram-like projector. When used with a holographic animation video, moving 3D images (holograms) appear inside the pyramid.