Top 100 presentations

1. Continuous Verb Tenses
   35406
2. Support and transport in plants
   33900
3. Anyong Tubig Anyong Lupa sa Asya
   29366
4. Elements compounds and mixtures
   26066
5. Chromosome
   22094
6. Simple Verb Tenses
   20820
7. Atomic Structure
   20298
8. Balancing Chemical Equations. Balancing redox equations
   20183
9. Periodic Behavior
   19927
10. Newton’s laws of motion
    18911
11. Periodic Trends
    16768
12. Adverbs
    16654
13. Percent Composition, Empirical and Molecular Formulas
    16001
14. Animal Farm
    15822
15. Bonding, Molecular Shape & Structure
    14776
16. Circulation and Gas Exchange
    13510
17. MakingFood
    13432
18. DNA - An overview
    13128
19. Atomic Structure and Periodic Trends
    12924
20. Fungi
    12910
21. Volumetric
    12700
22. Feminism- Cure or Curse
    12567
23. Atomic Structure and Periodicity
    12540
24. Hormones and the Endocrine System
    12205
25. Animal Development
    12146
26. Derivation Applications of Bernoulli Principal
    11929
27. Osmoregulation and Excretion
    11536
28. Plasma Membrane-Gateway to the Cell
    10822
29. Plant Structure, Growth, and Development
    10793
30. Acid, bases and salts
    10329
31. Development
    10254
32. Mirrors and Lenses
    10203
33. Structure of the Atom
    9955
34. Balanced forces
    9937
35. Ancient Civilizations
    9848
36. Mass Spectrometry
    9778
37. Pronouns
    9755
38. Nouns
    9703
39. Resource Acquisition and Transport in Vascular Plants
    9550
40. Forests
    9404
41. Support and transport in plants
    9383
42. Atomic Structure
    9326
43. Cell Types and Cell Structure
    8997
44. Newton’s third law of motion
    8958
45. Animal Nutrition
    8749
46. Transplantation Immunology
    8655
47. Cellular respiration
    8523
48. Growing Plants
    8394
49. Sensory and Motor Mechanisms
    8386
50. Electrical Circuits
    8270
51. Plant Responses to Internal and External Signals
    8245
52. Lab Equipment
    8061
53. Prepositions
    8003
54. Neurons, Synapses, and Signaling
    7935
55. Viruses, Viroids, and Prions
    7907
56. Of Mice and Men
    7848
57. A Tour of the Cell
    7775
58. Basic Structure of a Cell
    7680
59. Real time PCR and it's functions in diagnosis
    7647
60. Covalent Bonding (Molecules)
    7601
61. Plant structure adaptations and responses
    7554
62. Ionic Bonding
    7466
63. Cellular Division
    7460
64. Mendelian Genetics
    7121
65. To Kill a Mockingbird
    7101
66. Satellite Orbits and Uses NIS
    7051
67. Blood Type Genetics
    7044
68. Sound
    6967
69. Molecules and Ions
    6935
70. Well logging The Bore Hole
    6917
71. The Immune System
    6883
72. Membrane Structure and Function
    6810
73. Animal Reproduction
    6761
74. The Chemistry of Acids and Bases
    6696
75. Angiosperm Reproduction and Biotechnology
    6696
76. Plant Diversity
    6629
77. Rocks
    6621
78. Mendel and the Gene Idea
    6618
79. Cell Communication
    6592
80. Balancing Chemical Equations
    6515
81. Rate Laws
    6379
82. Drama
    6347
83. Introduction to Oscillations and Simple Harmonic Motion
    6344
84. Hybridization of Orbitals
    6331
85. The Building Blocks of Matter Atoms
    6276
86. Empirical Formula
    6221
87. An Introduction to Metabolism
    6188
88. Electron Quantum Numbers
    6186
89. Translation. Protein from RNA
    6100
90. Neurons
    6057
91. The Structure and Function of Large Biological Molecules
    6018
92. Photosynthesis
    5949
93. The Mole
    5916
94. Cell Membrane + Tissues & Organs Definitions
    5894
95. Earthquakes
    5853
96. Karyotypes
    5848
97. ADP, ATP and Cellular Respiration
    5812
98. Endocrine System
    5759
99. Classical greek philosophy
    5717
100. Population Ecology
     5688

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