Environmental Protection Department
http://www.epd.gov.hk/epd/

HKNature.net
http://www.hknature.net/index_e.html

Hong Kong Science Museum
http://hk.science.museum/en_US/web/scm/index.html

Green Power
http://www.greenpower.org.hk/html/chi/index.shtml

National Museum of Marine Biology and Aquarium
http://www.nmmba.gov.tw/

Electrical and Mechanical Services Department
http://www.emsd.gov.hk/en/home/index.html

Hydro Power, The Energy Story
http://www.energyquest.ca.gov/story/chapter12.html

The Water Cycle, BBC
http://www.bbc.co.uk/schools/riversandcoasts/water_cycle/rivers/pg_02_flash.shtml

Water cycle diagram, Earthguide
http://earthguide.ucsd.edu/earthguide/diagrams/watercycle/index.html

Water, Dialogue for Kids
http://www.idahoptv.org/dialogue4kids/season5/water/index.cfm

Water Science for Schools, USGS
http://ga.water.usgs.gov/edu/index.html

Water Supplies Department, the Government of the HKSAR
http://www.wsd.gov.hk/en/home/index.html

Water Use It Wisely
http://wateruseitwisely.com/index.php

WaterSense KIDS, US EPA (with a game)
http://www.epa.gov/watersense/kids/index.html
SCIENCE with me! *
http://www.sciencewithme.com

Hong Kong Fire Services Department, the Government of the HKSAR
http://www.hkfsd.gov.hk

Photosynthesis, Biology4Kids.com
http://www.biology4kids.com/files/plants_photosynthesis.html

Photosynthesis, NatureWorks
http://www.nhptv.org/natureworks/nwepphotosynthesis.htm

Exploring the Science of Light, Optical Society of America*
http://www.opticsforkids.org

Optics, Computer animations of physical processes
http://physics-animations.com/Physics/English/optics.htm

Optics for Kids, Optical Research Associates
http://www.opticalres.com/kidoptx_f.html

Science, Optics and You, Molecular Expressions*
http://micro.magnet.fsu.edu/optics/index.html

National Science Resources Center
http://www.nsrconline.org/index.html

Science for Kids*
http://www.sciencekids.co.nz

Science News for Kids*
http://www.sciencenewsforkids.org

Environmental Noise (Young Version), Environmental Protection Department
http://www.epd.gov.hk/epd/noise_education/young/eng_young_html/index/index.html

Rainbow, Hong Kong Observatory
http://www.weather.gov.hk/education/edu06nature/ele_rainbow_e.htm

Electricity, NDT Resource Center
http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/hs_elec_index.htm

Electricity. Tech Topics*
http://www.thetech.org/exhibits/online/topics/10a.html

Energizer Learning Center
http://energizer.com/learning-center/Pages/facts-history-care.aspx

Physical processes, BBC*
http://www.bbc.co.uk/schools/ks2bitesize/science/physical_processes

SciNet
http://www.nelsonthornes.com/secondary/science/scinet/scinet/index.htm

Energy Story
http://www.energyquest.ca.gov/story/index.html

Magnetism and Electricity, FOSSweb
http://www.fossweb.com/modules3-6/MagnetismandElectricity/index.html

What is an electromagnet?, Jefferson Lab
http://education.jlab.org/qa/electromagnet_is.html

CLP Group
https://www.clpgroup.com/Pages/home.aspx

Hongkong Electric Holdings Limited
https://www.hkelectric.com/zh

My PowerWise Home, CLP Online
https://www.clponline.com.hk/myHome/EnergyEfficiencyIdeas/MyPowerWiseHome/Pages/Default.aspx?lang=en