Top 100 presentations

1. Continuous Verb Tenses
   35059
2. Support and transport in plants
   33599
3. Anyong Tubig Anyong Lupa sa Asya
   29153
4. Elements compounds and mixtures
   25828
5. Chromosome
   21670
6. Simple Verb Tenses
   20683
7. Balancing Chemical Equations. Balancing redox equations
   19936
8. Atomic Structure
   19878
9. Periodic Behavior
   19765
10. Newton’s laws of motion
    18665
11. Periodic Trends
    16660
12. Adverbs
    16583
13. Percent Composition, Empirical and Molecular Formulas
    15904
14. Animal Farm
    15634
15. Bonding, Molecular Shape & Structure
    14579
16. MakingFood
    13266
17. Circulation and Gas Exchange
    13209
18. DNA - An overview
    12822
19. Fungi
    12741
20. Atomic Structure and Periodic Trends
    12665
21. Volumetric
    12543
22. Feminism- Cure or Curse
    12467
23. Atomic Structure and Periodicity
    12340
24. Hormones and the Endocrine System
    11938
25. Animal Development
    11763
26. Derivation Applications of Bernoulli Principal
    11760
27. Osmoregulation and Excretion
    11245
28. Plasma Membrane-Gateway to the Cell
    10667
29. Plant Structure, Growth, and Development
    10508
30. Acid, bases and salts
    10069
31. Development
    10031
32. Mirrors and Lenses
    9991
33. Structure of the Atom
    9830
34. Balanced forces
    9795
35. Mass Spectrometry
    9678
36. Pronouns
    9676
37. Ancient Civilizations
    9637
38. Nouns
    9587
39. Forests
    9280
40. Resource Acquisition and Transport in Vascular Plants
    9257
41. Support and transport in plants
    9225
42. Atomic Structure
    9198
43. Cell Types and Cell Structure
    8919
44. Newton’s third law of motion
    8811
45. Animal Nutrition
    8547
46. Transplantation Immunology
    8484
47. Cellular respiration
    8403
48. Growing Plants
    8213
49. Electrical Circuits
    8149
50. Sensory and Motor Mechanisms
    8138
51. Lab Equipment
    7918
52. Prepositions
    7912
53. Plant Responses to Internal and External Signals
    7900
54. Viruses, Viroids, and Prions
    7771
55. Neurons, Synapses, and Signaling
    7719
56. Of Mice and Men
    7696
57. Basic Structure of a Cell
    7557
58. Covalent Bonding (Molecules)
    7507
59. A Tour of the Cell
    7507
60. Real time PCR and it's functions in diagnosis
    7495
61. Plant structure adaptations and responses
    7479
62. Ionic Bonding
    7376
63. Cellular Division
    7293
64. To Kill a Mockingbird
    6970
65. Mendelian Genetics
    6960
66. Blood Type Genetics
    6926
67. Satellite Orbits and Uses NIS
    6896
68. Molecules and Ions
    6849
69. Well logging The Bore Hole
    6793
70. The Immune System
    6656
71. Sound
    6621
72. Membrane Structure and Function
    6578
73. Animal Reproduction
    6543
74. Rocks
    6522
75. The Chemistry of Acids and Bases
    6511
76. Angiosperm Reproduction and Biotechnology
    6489
77. Plant Diversity
    6445
78. Balancing Chemical Equations
    6405
79. Cell Communication
    6348
80. Mendel and the Gene Idea
    6346
81. Rate Laws
    6277
82. Drama
    6248
83. Hybridization of Orbitals
    6236
84. Introduction to Oscillations and Simple Harmonic Motion
    6176
85. The Building Blocks of Matter Atoms
    6140
86. Empirical Formula
    6128
87. Electron Quantum Numbers
    6088
88. Translation. Protein from RNA
    6049
89. An Introduction to Metabolism
    5962
90. Neurons
    5956
91. The Mole
    5848
92. The Structure and Function of Large Biological Molecules
    5808
93. Cell Membrane + Tissues & Organs Definitions
    5799
94. Karyotypes
    5779
95. ADP, ATP and Cellular Respiration
    5755
96. Earthquakes
    5745
97. Endocrine System
    5722
98. Photosynthesis
    5679
99. Classical greek philosophy
    5562
100. Conjunction
     5559

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