sci.* hierarchy
200 sci.electronics.design
110 sci.skeptic
108 sci.physics.relativity
96 sci.math
69 sci.logic
63 sci.med.cardiology
24 sci.physics
12 sci.engr.joining.welding
11 sci.crypt
9 sci.stat.math
5 sci.anthropology.paleo
4 sci.physics.research
3 sci.archaeology
2 sci.nonlinear
2 sci.misc
2 sci.med.dentistry
2 sci.lang
2 sci.geo.meteorology
2 sci.environment
2 sci.chem.electrochem.battery
1 sci.stat.consult
1 sci.space.tech
1 sci.space.shuttle
1 sci.space.science
1 sci.space.policy
1 sci.space.history
1 sci.psychology.theory
1 sci.psychology.psychotherapy
1 sci.psychology.personality
1 sci.psychology.misc
1 sci.physics.fusion
1 sci.philosophy.tech
1 sci.military.naval
1 sci.med.transcription
1 sci.med.radiology
1 sci.med.psychobiology
1 sci.med.prostate.cancer
1 sci.med.nutrition
1 sci.med.nursing
1 sci.med.laboratory
1 sci.med.diseases.lyme
1 sci.med.diseases.hepatitis
1 sci.med.diseases.cancer
1 sci.med.cannabis
1 sci.med
1 sci.math.symbolic
1 sci.math.num-analysis
1 sci.materials
1 sci.lang.translation
1 sci.lang.japan
1 sci.image.processing
1 sci.geo.rivers+lakes
1 sci.geo.petroleum
1 sci.geo.oceanography
1 sci.geo.mineralogy
1 sci.geo.geology
1 sci.geo.earthquakes
1 sci.environment.waste
1 sci.engr.mining
1 sci.engr.metallurgy
1 sci.engr.electrical.compliance
1 sci.engr
1 sci.energy
1 sci.electronics.repair
1 sci.electronics.equipment
1 sci.electronics.components
1 sci.electronics.basics
1 sci.econ
1 sci.bio.technology
1 sci.bio.paleontology
1 sci.bio.misc
1 sci.astro.seti
1 sci.astro.research
1 sci.astro.amateur
1 sci.astro
1 sci.anthropology
1 sci.answers
1 sci.agriculture.poultry
1 sci.agriculture.fruit
1 sci.agriculture
0 sci.techniques.xtallography
0 sci.techniques.testing.nondestructive
0 sci.techniques.testing.misc
0 sci.techniques.spectroscopy
0 sci.techniques.microscopy
0 sci.techniques.mag-resonance
0 sci.systems
0 sci.stat.edu
0 sci.space.station
0 sci.research.postdoc
0 sci.research.careers
0 sci.research
0 sci.psychology.research
0 sci.psychology.announce
0 sci.polymers
0 sci.physics.plasma
0 sci.physics.particle
0 sci.physics.electromag
0 sci.physics.cond-matter
0 sci.physics.computational.fluid-dynamics
0 sci.physics.acoustics
0 sci.physics.accelerators
0 sci.philosophy.meta
0 sci.optics.fiber
0 sci.optics
0 sci.op-research
0 sci.med.vision
0 sci.med.telemedicine
0 sci.med.radiology.interventional
0 sci.med.prostate.prostatitis
0 sci.med.prostate.bph
0 sci.med.physics
0 sci.med.pharmacy
0 sci.med.pathology
0 sci.med.informatics
0 sci.med.immunology
0 sci.med.diseases.osteoporosis
0 sci.med.diseases.als
0 sci.mech.fluids
0 sci.math.research
0 sci.materials.ceramics
0 sci.life-extension
0 sci.lang.translation.marketplace
0 sci.geo.satellite-nav
0 sci.geo.hydrology
0 sci.geo.fluids
0 sci.geo.eos
0 sci.geo.cartography
0 sci.fractals
0 sci.engr.television.broadcast
0 sci.engr.television.advanced
0 sci.engr.surveying
0 sci.engr.semiconductors
0 sci.engr.safety
0 sci.engr.radar+sonar
0 sci.engr.micromachining
0 sci.engr.mech
0 sci.engr.manufacturing
0 sci.engr.lighting
0 sci.engr.joining.misc
0 sci.engr.heat-vent-ac
0 sci.engr.geomechanics
0 sci.engr.electrical.sys-protection
0 sci.engr.control
0 sci.engr.color
0 sci.engr.civil
0 sci.engr.chem
0 sci.engr.biomed
0 sci.engr.analysis
0 sci.energy.hydrogen
0 sci.electronics.misc
0 sci.electronics.cad
0 sci.edu
0 sci.data.formats
0 sci.crypt.research
0 sci.crypt.random-numbers
0 sci.cryonics
0 sci.comp-aided
0 sci.cognitive
0 sci.chem.organomet
0 sci.chem.labware
0 sci.chem.electrochem
0 sci.chem.coatings
0 sci.chem.analytical
0 sci.chem
0 sci.bio.systematics
0 sci.bio.microbiology
0 sci.bio.immunocytochem
0 sci.bio.herp
0 sci.bio.food-science
0 sci.bio.fisheries
0 sci.bio.ethology
0 sci.bio.entomology.misc
0 sci.bio.entomology.lepidoptera
0 sci.bio.entomology.homoptera
0 sci.bio.ecology
0 sci.bio.botany
0 sci.astro.satellites.visual-observe
0 sci.astro.planetarium
0 sci.astro.hubble
0 sci.astro.fits
0 sci.astro.ccd-imaging
0 sci.archaeology.mesoamerican
0 sci.agriculture.ratites
0 sci.agriculture.beekeeping