Top 100 presentations

1. Continuous Verb Tenses
   35404
2. Support and transport in plants
   33897
3. Anyong Tubig Anyong Lupa sa Asya
   29357
4. Elements compounds and mixtures
   26063
5. Chromosome
   22076
6. Simple Verb Tenses
   20819
7. Atomic Structure
   20295
8. Balancing Chemical Equations. Balancing redox equations
   20181
9. Periodic Behavior
   19925
10. Newton’s laws of motion
    18909
11. Periodic Trends
    16766
12. Adverbs
    16653
13. Percent Composition, Empirical and Molecular Formulas
    16001
14. Animal Farm
    15822
15. Bonding, Molecular Shape & Structure
    14770
16. Circulation and Gas Exchange
    13507
17. MakingFood
    13430
18. DNA - An overview
    13121
19. Atomic Structure and Periodic Trends
    12921
20. Fungi
    12910
21. Volumetric
    12699
22. Feminism- Cure or Curse
    12567
23. Atomic Structure and Periodicity
    12537
24. Hormones and the Endocrine System
    12200
25. Animal Development
    12139
26. Derivation Applications of Bernoulli Principal
    11926
27. Osmoregulation and Excretion
    11535
28. Plasma Membrane-Gateway to the Cell
    10820
29. Plant Structure, Growth, and Development
    10789
30. Acid, bases and salts
    10328
31. Development
    10240
32. Mirrors and Lenses
    10203
33. Structure of the Atom
    9952
34. Balanced forces
    9935
35. Ancient Civilizations
    9843
36. Mass Spectrometry
    9778
37. Pronouns
    9750
38. Nouns
    9703
39. Resource Acquisition and Transport in Vascular Plants
    9546
40. Forests
    9401
41. Support and transport in plants
    9380
42. Atomic Structure
    9326
43. Cell Types and Cell Structure
    8996
44. Newton’s third law of motion
    8956
45. Animal Nutrition
    8746
46. Transplantation Immunology
    8652
47. Cellular respiration
    8522
48. Growing Plants
    8389
49. Sensory and Motor Mechanisms
    8383
50. Electrical Circuits
    8270
51. Plant Responses to Internal and External Signals
    8241
52. Lab Equipment
    8061
53. Prepositions
    8002
54. Neurons, Synapses, and Signaling
    7926
55. Viruses, Viroids, and Prions
    7907
56. Of Mice and Men
    7848
57. A Tour of the Cell
    7768
58. Basic Structure of a Cell
    7680
59. Real time PCR and it's functions in diagnosis
    7641
60. Covalent Bonding (Molecules)
    7600
61. Plant structure adaptations and responses
    7552
62. Ionic Bonding
    7465
63. Cellular Division
    7459
64. Mendelian Genetics
    7120
65. To Kill a Mockingbird
    7100
66. Satellite Orbits and Uses NIS
    7046
67. Blood Type Genetics
    7041
68. Sound
    6960
69. Molecules and Ions
    6935
70. Well logging The Bore Hole
    6916
71. The Immune System
    6876
72. Membrane Structure and Function
    6805
73. Animal Reproduction
    6757
74. The Chemistry of Acids and Bases
    6695
75. Angiosperm Reproduction and Biotechnology
    6693
76. Plant Diversity
    6626
77. Rocks
    6620
78. Mendel and the Gene Idea
    6618
79. Cell Communication
    6583
80. Balancing Chemical Equations
    6515
81. Rate Laws
    6379
82. Drama
    6346
83. Introduction to Oscillations and Simple Harmonic Motion
    6341
84. Hybridization of Orbitals
    6330
85. The Building Blocks of Matter Atoms
    6275
86. Empirical Formula
    6220
87. Electron Quantum Numbers
    6186
88. An Introduction to Metabolism
    6178
89. Translation. Protein from RNA
    6099
90. Neurons
    6055
91. The Structure and Function of Large Biological Molecules
    6011
92. Photosynthesis
    5944
93. The Mole
    5916
94. Cell Membrane + Tissues & Organs Definitions
    5893
95. Earthquakes
    5853
96. Karyotypes
    5846
97. ADP, ATP and Cellular Respiration
    5812
98. Endocrine System
    5758
99. Classical greek philosophy
    5717
100. Population Ecology
     5685

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