Top 100 presentations

1. Continuous Verb Tenses
   35559
2. Support and transport in plants
   34000
3. Anyong Tubig Anyong Lupa sa Asya
   29584
4. Elements compounds and mixtures
   26169
5. Chromosome
   22341
6. Simple Verb Tenses
   20885
7. Atomic Structure
   20428
8. Balancing Chemical Equations. Balancing redox equations
   20303
9. Periodic Behavior
   19991
10. Newton’s laws of motion
    19034
11. Periodic Trends
    16801
12. Adverbs
    16687
13. Percent Composition, Empirical and Molecular Formulas
    16051
14. Animal Farm
    15909
15. Bonding, Molecular Shape & Structure
    14876
16. Circulation and Gas Exchange
    13623
17. MakingFood
    13526
18. DNA - An overview
    13276
19. Atomic Structure and Periodic Trends
    13088
20. Fungi
    12979
21. Volumetric
    12805
22. Atomic Structure and Periodicity
    12623
23. Feminism- Cure or Curse
    12603
24. Hormones and the Endocrine System
    12375
25. Animal Development
    12284
26. Derivation Applications of Bernoulli Principal
    11976
27. Osmoregulation and Excretion
    11666
28. Plant Structure, Growth, and Development
    10904
29. Plasma Membrane-Gateway to the Cell
    10896
30. Acid, bases and salts
    10442
31. Development
    10339
32. Mirrors and Lenses
    10281
33. Structure of the Atom
    10018
34. Balanced forces
    9994
35. Ancient Civilizations
    9908
36. Resource Acquisition and Transport in Vascular Plants
    9824
37. Mass Spectrometry
    9816
38. Pronouns
    9795
39. Nouns
    9765
40. Support and transport in plants
    9468
41. Forests
    9445
42. Atomic Structure
    9392
43. Newton’s third law of motion
    9042
44. Cell Types and Cell Structure
    9031
45. Animal Nutrition
    8862
46. Transplantation Immunology
    8731
47. Cellular respiration
    8573
48. Sensory and Motor Mechanisms
    8507
49. Growing Plants
    8471
50. Plant Responses to Internal and External Signals
    8385
51. Electrical Circuits
    8320
52. Lab Equipment
    8121
53. Neurons, Synapses, and Signaling
    8049
54. Prepositions
    8024
55. Viruses, Viroids, and Prions
    7972
56. Of Mice and Men
    7923
57. A Tour of the Cell
    7917
58. Basic Structure of a Cell
    7725
59. Real time PCR and it's functions in diagnosis
    7701
60. Covalent Bonding (Molecules)
    7634
61. Cellular Division
    7600
62. Plant structure adaptations and responses
    7588
63. Ionic Bonding
    7497
64. Mendelian Genetics
    7192
65. To Kill a Mockingbird
    7142
66. Sound
    7142
67. Satellite Orbits and Uses NIS
    7123
68. Blood Type Genetics
    7074
69. The Immune System
    6993
70. Well logging The Bore Hole
    6982
71. Molecules and Ions
    6965
72. Membrane Structure and Function
    6912
73. Animal Reproduction
    6871
74. The Chemistry of Acids and Bases
    6828
75. Angiosperm Reproduction and Biotechnology
    6822
76. Mendel and the Gene Idea
    6748
77. Plant Diversity
    6720
78. Cell Communication
    6684
79. Rocks
    6658
80. Balancing Chemical Equations
    6559
81. Rate Laws
    6420
82. Introduction to Oscillations and Simple Harmonic Motion
    6411
83. Drama
    6390
84. Hybridization of Orbitals
    6368
85. The Building Blocks of Matter Atoms
    6352
86. An Introduction to Metabolism
    6301
87. Empirical Formula
    6254
88. Electron Quantum Numbers
    6230
89. The Structure and Function of Large Biological Molecules
    6125
90. Translation. Protein from RNA
    6116
91. Neurons
    6107
92. Photosynthesis
    6059
93. The Mole
    5943
94. Cell Membrane + Tissues & Organs Definitions
    5939
95. Earthquakes
    5892
96. Karyotypes
    5863
97. ADP, ATP and Cellular Respiration
    5845
98. Population Ecology
    5784
99. Classical greek philosophy
    5780
100. Endocrine System
     5773

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