Top 100 presentations

1. Continuous Verb Tenses
   35347
2. Support and transport in plants
   33839
3. Anyong Tubig Anyong Lupa sa Asya
   29308
4. Elements compounds and mixtures
   26025
5. Chromosome
   22007
6. Simple Verb Tenses
   20793
7. Atomic Structure
   20229
8. Balancing Chemical Equations. Balancing redox equations
   20145
9. Periodic Behavior
   19894
10. Newton’s laws of motion
    18871
11. Periodic Trends
    16753
12. Adverbs
    16644
13. Percent Composition, Empirical and Molecular Formulas
    15981
14. Animal Farm
    15791
15. Bonding, Molecular Shape & Structure
    14735
16. Circulation and Gas Exchange
    13462
17. MakingFood
    13399
18. DNA - An overview
    13068
19. Fungi
    12877
20. Atomic Structure and Periodic Trends
    12869
21. Volumetric
    12669
22. Feminism- Cure or Curse
    12550
23. Atomic Structure and Periodicity
    12506
24. Hormones and the Endocrine System
    12140
25. Animal Development
    12070
26. Derivation Applications of Bernoulli Principal
    11907
27. Osmoregulation and Excretion
    11483
28. Plasma Membrane-Gateway to the Cell
    10788
29. Plant Structure, Growth, and Development
    10742
30. Acid, bases and salts
    10266
31. Development
    10212
32. Mirrors and Lenses
    10150
33. Structure of the Atom
    9933
34. Balanced forces
    9905
35. Ancient Civilizations
    9821
36. Mass Spectrometry
    9760
37. Pronouns
    9733
38. Nouns
    9677
39. Resource Acquisition and Transport in Vascular Plants
    9497
40. Forests
    9388
41. Support and transport in plants
    9351
42. Atomic Structure
    9302
43. Cell Types and Cell Structure
    8987
44. Newton’s third law of motion
    8930
45. Animal Nutrition
    8698
46. Transplantation Immunology
    8632
47. Cellular respiration
    8505
48. Growing Plants
    8363
49. Sensory and Motor Mechanisms
    8331
50. Electrical Circuits
    8253
51. Plant Responses to Internal and External Signals
    8187
52. Lab Equipment
    8031
53. Prepositions
    7983
54. Viruses, Viroids, and Prions
    7886
55. Neurons, Synapses, and Signaling
    7882
56. Of Mice and Men
    7814
57. A Tour of the Cell
    7723
58. Basic Structure of a Cell
    7660
59. Real time PCR and it's functions in diagnosis
    7615
60. Covalent Bonding (Molecules)
    7587
61. Plant structure adaptations and responses
    7541
62. Ionic Bonding
    7453
63. Cellular Division
    7432
64. Mendelian Genetics
    7087
65. To Kill a Mockingbird
    7065
66. Satellite Orbits and Uses NIS
    7025
67. Blood Type Genetics
    7024
68. Molecules and Ions
    6920
69. Sound
    6905
70. Well logging The Bore Hole
    6903
71. The Immune System
    6831
72. Membrane Structure and Function
    6768
73. Animal Reproduction
    6717
74. The Chemistry of Acids and Bases
    6663
75. Angiosperm Reproduction and Biotechnology
    6658
76. Rocks
    6606
77. Mendel and the Gene Idea
    6589
78. Plant Diversity
    6586
79. Cell Communication
    6546
80. Balancing Chemical Equations
    6496
81. Rate Laws
    6359
82. Drama
    6323
83. Hybridization of Orbitals
    6313
84. Introduction to Oscillations and Simple Harmonic Motion
    6313
85. The Building Blocks of Matter Atoms
    6242
86. Empirical Formula
    6212
87. Electron Quantum Numbers
    6170
88. An Introduction to Metabolism
    6142
89. Translation. Protein from RNA
    6089
90. Neurons
    6031
91. The Structure and Function of Large Biological Molecules
    5972
92. The Mole
    5906
93. Photosynthesis
    5904
94. Cell Membrane + Tissues & Organs Definitions
    5875
95. Earthquakes
    5838
96. Karyotypes
    5834
97. ADP, ATP and Cellular Respiration
    5803
98. Endocrine System
    5753
99. Classical greek philosophy
    5694
100. Population Ecology
     5651

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