https://www.sciencelearn.org.nz/resources/50-how-the-eye-focuses-light
https://www.sciencefocus.com/future-technology/how-do-edible-water-bottles-work/
https://sites.google.com/site/bioprinterwiki/bioprinter-ink/sodium-alginate
https://opg.optica.org/oe/fulltext.cfm?uri=oe-28-5-6582&id=427698
https://opg.optica.org/oe/fulltext.cfm?uri=oe-15-18-11328&id=140987
https://www.youtube.com/watch?v=k2-uzd9gPX8&ab_channel=BretLittle
https://www.youtube.com/watch?v=NszMD3UtoBY&ab_channel=MichelvanBiezen
https://www.youtube.com/watch?v=635-LOiONYU&ab_channel=sciencefix
https://www.youtube.com/watch?v=BM7xvaTIm9k&ab_channel=KhanAcademyIndia-English
https://www.youtube.com/watch?v=y55tzg_jW9I&ab_channel=KhanAcademy
https://www.youtube.com/watch?v=HMopGliM1dA&ab_channel=KhanAcademyIndia-English