Top 100 presentations

1. Continuous Verb Tenses
   35375
2. Support and transport in plants
   33862
3. Anyong Tubig Anyong Lupa sa Asya
   29330
4. Elements compounds and mixtures
   26042
5. Chromosome
   22040
6. Simple Verb Tenses
   20805
7. Atomic Structure
   20267
8. Balancing Chemical Equations. Balancing redox equations
   20161
9. Periodic Behavior
   19909
10. Newton’s laws of motion
    18887
11. Periodic Trends
    16756
12. Adverbs
    16646
13. Percent Composition, Empirical and Molecular Formulas
    15989
14. Animal Farm
    15805
15. Bonding, Molecular Shape & Structure
    14752
16. Circulation and Gas Exchange
    13481
17. MakingFood
    13412
18. DNA - An overview
    13094
19. Atomic Structure and Periodic Trends
    12903
20. Fungi
    12891
21. Volumetric
    12685
22. Feminism- Cure or Curse
    12561
23. Atomic Structure and Periodicity
    12521
24. Hormones and the Endocrine System
    12167
25. Animal Development
    12107
26. Derivation Applications of Bernoulli Principal
    11915
27. Osmoregulation and Excretion
    11506
28. Plasma Membrane-Gateway to the Cell
    10803
29. Plant Structure, Growth, and Development
    10765
30. Acid, bases and salts
    10291
31. Development
    10219
32. Mirrors and Lenses
    10181
33. Structure of the Atom
    9942
34. Balanced forces
    9923
35. Ancient Civilizations
    9835
36. Mass Spectrometry
    9770
37. Pronouns
    9738
38. Nouns
    9688
39. Resource Acquisition and Transport in Vascular Plants
    9516
40. Forests
    9393
41. Support and transport in plants
    9365
42. Atomic Structure
    9310
43. Cell Types and Cell Structure
    8991
44. Newton’s third law of motion
    8943
45. Animal Nutrition
    8716
46. Transplantation Immunology
    8640
47. Cellular respiration
    8508
48. Growing Plants
    8370
49. Sensory and Motor Mechanisms
    8359
50. Electrical Circuits
    8258
51. Plant Responses to Internal and External Signals
    8209
52. Lab Equipment
    8043
53. Prepositions
    7992
54. Neurons, Synapses, and Signaling
    7904
55. Viruses, Viroids, and Prions
    7897
56. Of Mice and Men
    7828
57. A Tour of the Cell
    7743
58. Basic Structure of a Cell
    7669
59. Real time PCR and it's functions in diagnosis
    7635
60. Covalent Bonding (Molecules)
    7592
61. Plant structure adaptations and responses
    7547
62. Ionic Bonding
    7456
63. Cellular Division
    7446
64. Mendelian Genetics
    7108
65. To Kill a Mockingbird
    7076
66. Satellite Orbits and Uses NIS
    7038
67. Blood Type Genetics
    7033
68. Sound
    6935
69. Molecules and Ions
    6926
70. Well logging The Bore Hole
    6906
71. The Immune System
    6859
72. Membrane Structure and Function
    6783
73. Animal Reproduction
    6732
74. The Chemistry of Acids and Bases
    6675
75. Angiosperm Reproduction and Biotechnology
    6671
76. Rocks
    6611
77. Plant Diversity
    6609
78. Mendel and the Gene Idea
    6608
79. Cell Communication
    6564
80. Balancing Chemical Equations
    6507
81. Rate Laws
    6369
82. Drama
    6329
83. Introduction to Oscillations and Simple Harmonic Motion
    6327
84. Hybridization of Orbitals
    6323
85. The Building Blocks of Matter Atoms
    6262
86. Empirical Formula
    6216
87. Electron Quantum Numbers
    6178
88. An Introduction to Metabolism
    6160
89. Translation. Protein from RNA
    6094
90. Neurons
    6039
91. The Structure and Function of Large Biological Molecules
    5987
92. Photosynthesis
    5921
93. The Mole
    5911
94. Cell Membrane + Tissues & Organs Definitions
    5885
95. Earthquakes
    5845
96. Karyotypes
    5841
97. ADP, ATP and Cellular Respiration
    5806
98. Endocrine System
    5754
99. Classical greek philosophy
    5705
100. Population Ecology
     5661

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)