Top 100 presentations

1. Continuous Verb Tenses
   35180
2. Support and transport in plants
   33684
3. Anyong Tubig Anyong Lupa sa Asya
   29222
4. Elements compounds and mixtures
   25892
5. Chromosome
   21822
6. Simple Verb Tenses
   20730
7. Balancing Chemical Equations. Balancing redox equations
   20013
8. Atomic Structure
   19975
9. Periodic Behavior
   19822
10. Newton’s laws of motion
    18744
11. Periodic Trends
    16698
12. Adverbs
    16604
13. Percent Composition, Empirical and Molecular Formulas
    15927
14. Animal Farm
    15699
15. Bonding, Molecular Shape & Structure
    14644
16. MakingFood
    13312
17. Circulation and Gas Exchange
    13301
18. DNA - An overview
    12943
19. Fungi
    12792
20. Atomic Structure and Periodic Trends
    12738
21. Volumetric
    12595
22. Feminism- Cure or Curse
    12502
23. Atomic Structure and Periodicity
    12412
24. Hormones and the Endocrine System
    12027
25. Animal Development
    11868
26. Derivation Applications of Bernoulli Principal
    11815
27. Osmoregulation and Excretion
    11330
28. Plasma Membrane-Gateway to the Cell
    10712
29. Plant Structure, Growth, and Development
    10584
30. Acid, bases and salts
    10143
31. Development
    10109
32. Mirrors and Lenses
    10037
33. Structure of the Atom
    9875
34. Balanced forces
    9840
35. Ancient Civilizations
    9747
36. Mass Spectrometry
    9708
37. Pronouns
    9700
38. Nouns
    9629
39. Resource Acquisition and Transport in Vascular Plants
    9366
40. Forests
    9330
41. Support and transport in plants
    9264
42. Atomic Structure
    9243
43. Cell Types and Cell Structure
    8953
44. Newton’s third law of motion
    8855
45. Animal Nutrition
    8600
46. Transplantation Immunology
    8535
47. Cellular respiration
    8449
48. Growing Plants
    8280
49. Sensory and Motor Mechanisms
    8224
50. Electrical Circuits
    8185
51. Plant Responses to Internal and External Signals
    7997
52. Lab Equipment
    7961
53. Prepositions
    7936
54. Viruses, Viroids, and Prions
    7829
55. Neurons, Synapses, and Signaling
    7783
56. Of Mice and Men
    7743
57. Basic Structure of a Cell
    7600
58. A Tour of the Cell
    7582
59. Real time PCR and it's functions in diagnosis
    7544
60. Covalent Bonding (Molecules)
    7533
61. Plant structure adaptations and responses
    7514
62. Ionic Bonding
    7413
63. Cellular Division
    7356
64. Mendelian Genetics
    7004
65. To Kill a Mockingbird
    7001
66. Blood Type Genetics
    6966
67. Satellite Orbits and Uses NIS
    6944
68. Molecules and Ions
    6874
69. Well logging The Bore Hole
    6840
70. The Immune System
    6742
71. Sound
    6727
72. Membrane Structure and Function
    6632
73. Animal Reproduction
    6604
74. The Chemistry of Acids and Bases
    6576
75. Rocks
    6563
76. Angiosperm Reproduction and Biotechnology
    6551
77. Plant Diversity
    6502
78. Balancing Chemical Equations
    6434
79. Mendel and the Gene Idea
    6426
80. Cell Communication
    6415
81. Rate Laws
    6310
82. Drama
    6282
83. Hybridization of Orbitals
    6259
84. Introduction to Oscillations and Simple Harmonic Motion
    6234
85. The Building Blocks of Matter Atoms
    6192
86. Empirical Formula
    6173
87. Electron Quantum Numbers
    6119
88. Translation. Protein from RNA
    6064
89. An Introduction to Metabolism
    6030
90. Neurons
    5990
91. The Mole
    5873
92. The Structure and Function of Large Biological Molecules
    5870
93. Cell Membrane + Tissues & Organs Definitions
    5827
94. Karyotypes
    5801
95. Earthquakes
    5786
96. ADP, ATP and Cellular Respiration
    5770
97. Photosynthesis
    5748
98. Endocrine System
    5731
99. Classical greek philosophy
    5604
100. Conjunction
     5585

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