QC Physics 110 human 88 Glass 87 Technology: general issues 83 Humans 79 History of engineering and technology 61 TP Chemical technology 53 Research & information: general 42 procedures 39 Article 36 TK Electrical engineering. Electronics Nuclear engineering 35 female 35 male 35 TA Engineering (General). Civil engineering (General) 33 adult 33 QD Chemistry 29 Q Science (General) 28 Male 27 TJ Mechanical engineering and machinery 27 Archaeology 26 Substrates 26 Female 25 chemistry 25 Materials science 24 Scanning electron microscopy 23 controlled study 23 Glass transition 21 glass ionomer 20 Adult 19 COVID-19 19