Top 100 presentations

1. Continuous Verb Tenses
   35312
2. Support and transport in plants
   33791
3. Anyong Tubig Anyong Lupa sa Asya
   29288
4. Elements compounds and mixtures
   25990
5. Chromosome
   21966
6. Simple Verb Tenses
   20785
7. Atomic Structure
   20201
8. Balancing Chemical Equations. Balancing redox equations
   20113
9. Periodic Behavior
   19879
10. Newton’s laws of motion
    18846
11. Periodic Trends
    16742
12. Adverbs
    16635
13. Percent Composition, Empirical and Molecular Formulas
    15970
14. Animal Farm
    15773
15. Bonding, Molecular Shape & Structure
    14717
16. Circulation and Gas Exchange
    13407
17. MakingFood
    13386
18. DNA - An overview
    13039
19. Fungi
    12862
20. Atomic Structure and Periodic Trends
    12821
21. Volumetric
    12650
22. Feminism- Cure or Curse
    12540
23. Atomic Structure and Periodicity
    12490
24. Hormones and the Endocrine System
    12119
25. Animal Development
    12032
26. Derivation Applications of Bernoulli Principal
    11894
27. Osmoregulation and Excretion
    11452
28. Plasma Membrane-Gateway to the Cell
    10774
29. Plant Structure, Growth, and Development
    10697
30. Acid, bases and salts
    10229
31. Development
    10198
32. Mirrors and Lenses
    10117
33. Structure of the Atom
    9923
34. Balanced forces
    9893
35. Ancient Civilizations
    9810
36. Mass Spectrometry
    9751
37. Pronouns
    9727
38. Nouns
    9670
39. Resource Acquisition and Transport in Vascular Plants
    9480
40. Forests
    9373
41. Support and transport in plants
    9337
42. Atomic Structure
    9293
43. Cell Types and Cell Structure
    8984
44. Newton’s third law of motion
    8920
45. Animal Nutrition
    8675
46. Transplantation Immunology
    8619
47. Cellular respiration
    8496
48. Growing Plants
    8346
49. Sensory and Motor Mechanisms
    8312
50. Electrical Circuits
    8240
51. Plant Responses to Internal and External Signals
    8142
52. Lab Equipment
    8027
53. Prepositions
    7974
54. Viruses, Viroids, and Prions
    7874
55. Neurons, Synapses, and Signaling
    7851
56. Of Mice and Men
    7800
57. A Tour of the Cell
    7685
58. Basic Structure of a Cell
    7647
59. Real time PCR and it's functions in diagnosis
    7597
60. Covalent Bonding (Molecules)
    7578
61. Plant structure adaptations and responses
    7533
62. Ionic Bonding
    7443
63. Cellular Division
    7423
64. Mendelian Genetics
    7077
65. To Kill a Mockingbird
    7048
66. Blood Type Genetics
    7014
67. Satellite Orbits and Uses NIS
    7006
68. Molecules and Ions
    6911
69. Well logging The Bore Hole
    6890
70. Sound
    6872
71. The Immune System
    6809
72. Membrane Structure and Function
    6738
73. Animal Reproduction
    6701
74. The Chemistry of Acids and Bases
    6651
75. Angiosperm Reproduction and Biotechnology
    6636
76. Rocks
    6599
77. Mendel and the Gene Idea
    6569
78. Plant Diversity
    6566
79. Cell Communication
    6504
80. Balancing Chemical Equations
    6481
81. Rate Laws
    6352
82. Drama
    6315
83. Hybridization of Orbitals
    6304
84. Introduction to Oscillations and Simple Harmonic Motion
    6300
85. The Building Blocks of Matter Atoms
    6226
86. Empirical Formula
    6210
87. Electron Quantum Numbers
    6159
88. An Introduction to Metabolism
    6116
89. Translation. Protein from RNA
    6083
90. Neurons
    6027
91. The Structure and Function of Large Biological Molecules
    5948
92. The Mole
    5902
93. Photosynthesis
    5885
94. Cell Membrane + Tissues & Organs Definitions
    5869
95. Earthquakes
    5829
96. Karyotypes
    5826
97. ADP, ATP and Cellular Respiration
    5792
98. Endocrine System
    5751
99. Classical greek philosophy
    5679
100. Population Ecology
     5638

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