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...Liquid mercury drops on a pit black background.] Drops of liquid mercury It is worth pausing to consider what is meant by toxicity with regard to a compound. The German physician Paracelsus explored the relationship between dose and response. To paraphrase his conclusion: All things are poison and nothing without poison. Solely the dose determines that a thing is not a...

...liquid fuel Like most plant seeds, the coffee bean contains a significant amount of oil which can either be squeezed out or chemically extracted. It can then be converted into biodiesel, a liquid with similar properties to that of regular diesel. My own research found coffee-derived biodiesel wasn’t affected by where the coffee was grown, the type of bean or how it was...

...solid and translucent colours) polyphenylsulfone (selected for high-strength applications) PETG (impact resistant, but higher density than ABS). Design: Component design is limited by the following: Strength and thoroughness can be influenced by many factors including time of build, atmosphere and even polymer colour. Overhanging regions need extra designing. Structures...

...Solid Waste Association — published in The Global E-waste Monitor 2017, lays blame on falling prices that make electronic devices affordable and widely available. In developing countries, a growing middle class with disposable incomes means that more electronic goods are being bought and replaced more frequently, according to the study. Asia, with its growing economies,...

...liquid water ocean, which may rise through the icy crust, creating subsurface lakes that freeze and cause the overlying ice to fragment, float and resettle into new ‘chaotic’ positions (Figure 1). This ice bares resemblance to icebergs here on Earth. The ice that creates these features is water ice, but by performing multiple surface flybys of Europa, Galileo and Juno...